U.S. patent application number 14/517698 was filed with the patent office on 2015-07-30 for application specific congestion control in a wireless network.
This patent application is currently assigned to Intel IP Corporation. The applicant listed for this patent is Intel IP Corporation. Invention is credited to Hyung-Nam Choi, Marta Martinez Tarradell, Jerome Parron, Ana Lucia A. Pinheiro, Robert Zaus.
Application Number | 20150215845 14/517698 |
Document ID | / |
Family ID | 53680408 |
Filed Date | 2015-07-30 |
United States Patent
Application |
20150215845 |
Kind Code |
A1 |
Pinheiro; Ana Lucia A. ; et
al. |
July 30, 2015 |
APPLICATION SPECIFIC CONGESTION CONTROL IN A WIRELESS NETWORK
Abstract
Application-specific Congestion control for Data Communication
(ACDC) may be implemented by limiting, on a per-application or
per-application category basis, access to certain Access Point
Names (APNs). For example, during network radio congestion, a
mobile device, before allowing an application to initiate a data
communication channel, may determine the APN associated with the
application and whether the APN is currently a permitted or
prohibited APN. In another implementation, ACDC may be implemented
by limiting access to certain bearer connections. In some
implementations, a combination of APN barring and bearer barring
may be used.
Inventors: |
Pinheiro; Ana Lucia A.;
(Breinigsville, PA) ; Zaus; Robert; (Muenchen,
DE) ; Parron; Jerome; (Fuerth, DE) ; Martinez
Tarradell; Marta; (Hillsboro, OR) ; Choi;
Hyung-Nam; (Hamburg, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Intel IP Corporation |
Santa Clara |
CA |
US |
|
|
Assignee: |
Intel IP Corporation
Santa Clara
CA
|
Family ID: |
53680408 |
Appl. No.: |
14/517698 |
Filed: |
October 17, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61933866 |
Jan 30, 2014 |
|
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Current U.S.
Class: |
455/418 ;
455/26.1 |
Current CPC
Class: |
H04W 48/06 20130101;
H04W 88/02 20130101 |
International
Class: |
H04W 48/06 20060101
H04W048/06; H04W 8/18 20060101 H04W008/18; H04W 28/02 20060101
H04W028/02; H04M 1/725 20060101 H04M001/725 |
Claims
1. User Equipment (UE) comprising: a computer-readable medium to
store a mapping between Access Point Names (APNs), associated with
a network, and applications associated with the UE; and processing
circuitry to: determine a barring status associated with the APNs,
the barring status indicating whether communications associated
with one or more of the APNs should be barred by the UE; and block
a transmission of application requests to the network, from a
particular application associated with the UE, when a barring
status of the APN associated with the particular application
indicates that communications should be barred.
2. The UE of claim 1, wherein the mappings are stored as
application categories that are associated with APNs.
3. The UE of claim 1, wherein determining the barring status
further includes receiving the barring status as a probability
value or time period.
4. The UE of claim 1, wherein the processing circuitry is further
to: determine whether APN barring has been activated by the
network; and wherein blocking the transmission of the application
requests is performed only when APN barring has been activated by
the network.
5. The UE of claim 1, wherein, when determining the barring status
associated with the APNs, the processing circuitry is further to:
receive, from the network, an enumeration of APNs that have a
barring status indicating that communications associated with any
of the APNs in the enumeration should be barred by the UE.
6. The UE of claim 5, wherein the enumeration of APNs is received
as part of a System Information Block Type 2 message or a dedicated
message.
7. The UE of claim 1, wherein, when determining the barring status
associated with the APNs, the processing circuitry is further to:
receive, from the network, an enumeration of APNs that have a
barring status indicating that communications associated with any
APN that is not in the enumeration should be barred by the UE.
8. The UE of claim 7, wherein the enumeration of APNs is received
as part of a System Information Block Type 2 message or a dedicated
message.
9. The UE of claim 1, wherein, when determining the barring status
associated with the APNs, the processing circuitry is further to:
receive, from the network, an indication of the barring status, for
a particular APN, in conjunction with establishment of a default or
dedicated Evolved Packet System (EPS) bearer for the APN.
10. The UE of claim 1, wherein, when determining the barring status
associated with the APNs, the processing circuitry is further to:
receive, from the network, an indication of the barring status, for
a particular APN, as a priority value associated with the
particular APN, wherein blocking the transmission of application
requests to the network is based on a comparison of the priority
associated with the particular APN to a priority value allowed by
the network.
11. The UE of claim 1, wherein, when determining the barring status
associated with the APNs, the processing circuitry is further to:
receive, from the network, an indication of the barring status, for
a particular APN, as an enumeration of levels of acceptable
congestion for the APN, wherein blocking the transmission of
application requests to the network is based on a comparison of the
enumeration of the levels of acceptable congestion for the APN with
an indication of a current congestion level of the network.
12. A method comprising: storing, by User Equipment (UE), a mapping
between Access Point Names (APNs), associated with a network, and
applications associated with the UE; determining, by the UE, a
barring status associated with the APNs, the barring status
indicating whether communications associated with one or more of
the APNs should be barred by the UE; and refraining, by the UE,
from transmitting requests to the network, from a particular
application associated with the UE, when a current barring status
of the APN associated with the particular application indicates
that communications should be barred.
13. The method of claim 12, wherein the determining of the barring
status associated with the APNs further includes: receiving, from
the network, an enumeration of APNs that have a barring status
indicating that communications associated with any of the APNs in
the enumeration should be barred by the UE.
14. The method of claim 12, wherein the determining of the barring
status associated with the APNs further includes: receiving, from
the network, an enumeration of APNs that have a barring status
indicating that communications associated with any APN that is not
in the enumeration should be barred by the UE.
15. The method of claim 12, wherein the determining of the barring
status associated with the APNs further includes: receiving, from
the network, an indication of the barring status, for a particular
APN, during establishment of a default or dedicated Evolved Packet
System (EPS) bearer for the APN.
16. The method of claim 12, wherein the determining of the barring
status associated with the APNs further includes: receiving, from
the network, an indication of the barring status, for a particular
APN, as a priority value associated with the particular APN,
wherein blocking the transmission of requests to the network is
based on a comparison of the priority associated with the
particular APN with to an indication of a priority value allowed by
the network.
17. The method of claim 12, wherein the determining of the barring
status associated with the APNs further includes: receiving, from
the network, an indication of the barring status, for a particular
APN, as an enumeration of levels of acceptable congestion for the
APN, wherein blocking the transmission of application requests to
the network is based on a comparison of the enumeration of the
levels of acceptable congestion for the APN with an indication of a
current congestion level of the network.
18. User Equipment (UE) comprising: a computer-readable medium to
store a mapping between Evolved Packet System (EPS) bearer
connections, associated with a network, and applications associated
with the UE; and processing circuitry to: determine an EPS bearer
barring status associated with the EPS bearer connections, the EPS
bearer barring status indicating whether communications associated
with one or more of the EPS bearer connections should be barred by
the UE; receive an indication, from the network, of whether EPS
bearer barring should be active; and block communications,
requested by a particular application associated with the UE, when
an EPS bearer barring status of the EPS bearer connection
associated with the particular application indicates that
communications should be barred and when EPS bearer barring was
indicated as being active for the network.
19. The UE of claim 18, wherein the EPS bearer connections are
represented by a bearer identity value.
20. The UE of claim 18, wherein determining the EPS bearer barring
status further includes: receiving the EPS bearer barring status as
part of an initial configuration of the EPS bearer connections.
21. The UE of claim 18, wherein determining the EPS bearer barring
status further includes: receiving the EPS bearer barring status,
for a particular EPS bearer connection, as a priority value
associated with the particular EPS bearer connection, wherein
blocking the communications by the particular application is based
on a comparison of the priority associated with the particular EPS
bearer to a priority value allowed by the network.
22. The UE of claim 18, wherein determining the EPS bearer barring
status further includes: receiving the EPS bearer barring status,
for a particular EPS bearer connection, as an enumeration of levels
of acceptable congestion for the EPS bearer connection, wherein
blocking the communications by the particular application is based
on a comparison of the enumeration of the levels of acceptable
congestion for the EPS bearer connection with an indication of a
current congestion level of the network.
23. The UE of claim 18, wherein determining the EPS bearer barring
status further includes: receiving the EPS bearer barring status as
information included in a dedicated network message that is
received during initial configuration of an EPS bearer.
24. The UE of claim 18, wherein determining the EPS bearer barring
status further includes: receiving the EPS bearer barring status as
a bitmap value in which each bit in the bitmap value corresponds to
a particular bearer connection.
Description
RELATED APPLICATIONS
[0001] The present application claims the benefit of U.S.
Provisional Patent Application No. 61/933,866, which was filed on
Jan. 30, 2014, and which is hereby incorporated by reference as
though fully set forth herein.
BACKGROUND
[0002] Wireless mobile communication devices, such as smart phones
or other mobile devices, may download and run applications that
communicate via a network, such as a cellular network to which the
wireless mobile device is connected. Some applications can
(intentionally or unintentionally) cause or contribute to network
congestion. In the case of a wireless cellular network, the radio
access network (RAN) portion of the network may be particularly
subject to congestion. Additionally, some applications can cause
other issues, such as issues relating to transmission of private
information without user consent or the enablement of illegal or
other prohibited activities.
[0003] One proposal to limit network activity on an
application-basis is known as ACDC (Application specific Congestion
control for Data Communication), as proposed in Release 13 of the
3rd Generation Partnership Project (3GPP). An objective of ACDC is
to provide network operators a mechanism to allow or prohibit with
respect to particular applications defined by network
operators.
BRIEF DESCRIPTION OF THE DRAWINGS
[0004] Embodiments of the present invention will be readily
understood by the following detailed description in conjunction
with the accompanying drawings. To facilitate this description,
like reference numerals may designate like structural elements.
Embodiments of the invention are illustrated by way of example and
not by way of limitation in the figures of the accompanying
drawings.
[0005] FIG. 1A is a diagram illustrating an example of an overview
of concepts described herein, in which network activity is limited
based on Access Point Names (APNs);
[0006] FIG. 1B is a diagram illustrating an example of an overview
of concepts described herein, in which ACDC is implemented based on
bearers;
[0007] FIG. 2 is a diagram of an example environment in which
systems and/or methods described herein may be implemented;
[0008] FIGS. 3A-3C are diagrams illustrating the mapping of
applications and/or application categories with APNs;
[0009] FIG. 4 is a flowchart illustrating an example of a process
relating to APN barring;
[0010] FIGS. 5-9 are diagrams conceptually illustrating APN barring
using different techniques described herein;
[0011] FIGS. 10A and 10B are diagrams illustrating mappings based
on bearers;
[0012] FIG. 11 is a flowchart illustrating an example of a process
relating to bearer barring; and
[0013] FIG. 12 is a diagram of example components of a device.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0014] The following detailed description refers to the
accompanying drawings. The same reference numbers in different
drawings may identify the same or similar elements. It is to be
understood that other embodiments may be utilized and structural or
logical changes may be made without departing from the scope of the
present disclosure. Therefore, the following detailed description
is not to be taken in a limiting sense, and the scope of
embodiments in accordance with the present invention is defined by
the appended claims and their equivalents.
[0015] Techniques described herein relate to techniques for
implementing ACDC in a wireless network, such as cellular network
based on the Long-Term Evolution (LTE) standard for wireless
communication of data for mobile phones and data terminals. In one
implementation, ACDC may be implemented by limiting, on a
per-application or per-application category basis, access to
certain Access Point Names (APNs). For example, during network
radio congestion, a mobile device, before allowing an application
to initiate a data communication channel, may determine the APN
associated with the application and whether the APN is currently a
permitted or prohibited APN. Limiting access to certain APNs, to
implement ACDC, will be referred to as "APN barring" herein.
[0016] In a second implementation, ACDC may be implemented by
limiting access to certain bearer connections, such as, for LTE,
certain Evolved Packet System (EPS) bearers that carry specific
application traffic. Limiting access to certain bearers, to
implement ACDC, will be referred to as "bearer barring" herein. In
some implementations, a combination of APN barring and bearer
barring may be used.
[0017] One implementation described herein may include User
Equipment (UE) that comprises: a computer-readable medium to store
a mapping between Access Point Names (APNs), associated with a
network, and applications associated with the UE; and processing
circuitry. The processing circuitry is to: determine a barring
status associated with the APNs, the barring status indicating
whether communications associated with one or more of the APNs
should be barred by the UE; and block a transmission of application
requests to the network, from a particular application associated
with the UE, when a barring status of the APN associated with the
particular application indicates that communications should be
barred.
[0018] The mappings may be stored as application categories that
are associated with APNs. The determination of the barring status
may further include receiving the barring status as a probability
value or time period.
[0019] The processing circuitry may be further to determine whether
APN barring has been activated by the network; and wherein blocking
the transmission of the application requests is performed only when
APN barring has been activated by the network. When determining the
barring status associated with the APNs, the processing circuitry
may be further to receive, from the network, an enumeration of APNs
that have a barring status indicating that communications
associated with any of the APNs in the enumeration should be barred
by the UE. In some implementations, the enumeration of APNs may be
received as part of a System Information Block Type 2 message or a
dedicated message.
[0020] In some implementations, when determining the barring status
associated with the APNs, the processing circuitry may be further
to: receive, from the network, an enumeration of APNs that have a
barring status indicating that communications associated with any
APN that is not in the enumeration should be barred by the UE.
[0021] In some implementations, when determining the barring status
associated with the APNs, the processing circuitry may be further
to: receive, from the network, an indication of the barring status,
for a particular APN, in conjunction with establishment of a
default or dedicated EPS bearer for the APN. When determining the
barring status associated with the APNs, the processing circuitry
may be further to: receive, from the network, an indication of the
barring status, for a particular APN, as a priority value
associated with the particular APN, wherein blocking the
transmission of application requests to the network is based on a
comparison of the priority associated with the particular APN to a
priority value allowed by the network. When determining the barring
status associated with the APNs, the processing circuitry may be
further to: receive, from the network, an indication of the barring
status, for a particular APN, as an enumeration of levels of
acceptable congestion for the APN, wherein blocking the
transmission of application requests to the network is based on a
comparison of the enumeration of the levels of acceptable
congestion for the APN with an indication of a current congestion
level of the network.
[0022] In another possible implementation, a method may include
storing, by UE, a mapping between APNs, associated with a network,
and applications associated with the UE; determining, by the UE, a
barring status associated with the APNs, the barring status
indicating whether communications associated with one or more of
the APNs should be barred by the UE; and refraining, by the UE,
from transmitting requests to the network, from a particular
application associated with the UE, when a current barring status
of the APN associated with the particular application indicates
that communications should be barred.
[0023] In another implementation, UE may comprise: a
computer-readable medium to store a mapping between EPS bearer
connections, associated with a network, and applications associated
with the UE; and processing circuitry. The processing circuitry may
be to: determine an EPS bearer barring status associated with the
EPS bearer connections, the EPS bearer barring status indicating
whether communications associated with one or more of the EPS
bearer connections should be barred by the UE; receive an
indication, from the network, of whether EPS bearer barring should
be active; and block communications, requested by a particular
application associated with the UE, when an EPS bearer barring
status of the EPS bearer connection associated with the particular
application indicates that communications should be barred and when
EPS bearer barring was indicated as being active for the
network.
[0024] In one implementation, the EPS bearer connections may be
represented by a bearer identity value. In another implementation,
determining the EPS bearer barring status may further include
receiving the EPS bearer barring status as part of an initial
configuration of the EPS bearer connections.
[0025] The determination of the EPS bearer barring status may
further include receiving the EPS bearer barring status, for a
particular EPS bearer connection, as a priority value associated
with the particular EPS bearer connection, wherein blocking the
communications by the particular application is based on a
comparison of the priority associated with the particular EPS
bearer to a priority value allowed by the network. The
determination of the EPS bearer barring status may further include:
receiving the EPS bearer barring status, for a particular EPS
bearer connection, as an enumeration of levels of acceptable
congestion for the EPS bearer connection, wherein blocking the
communications by the particular application is based on a
comparison of the enumeration of the levels of acceptable
congestion for the EPS bearer connection with an indication of a
current congestion level of the network. The determination of the
EPS bearer barring status may further include: receiving the EPS
bearer barring status as information included in a dedicated
network message that is received during initial configuration of an
EPS bearer. The determination of the EPS bearer barring status may
further include receiving the EPS bearer barring status as a bitmap
value in which each bit in the bitmap value corresponds to a
particular bearer connection.
[0026] In yet another possible implementation, UE may comprise
processing circuitry to: receive a request, from an application
associated with the UE, to initiate network communications with a
PDN; receive an indication, from the network, of whether barring is
active for the network; determine, based on a barring status
associated with an APN or an EPS bearer connection associated with
the application, a barring status associated with the application;
block transmission of the request, to initiate the network
communications, when the barring status indicates that the
application is barred and when the barring is indicated as being
active for the network; and transmit the request, to initiate the
network communications, when the barring status indicates that the
application is not barred or when the barring is not indicated as
being active for the network.
[0027] In yet another possible implementation, UE may comprise
means for storing a mapping between APNs, associated with a
network, and applications associated with the UE; means for
determining a barring status associated with the APNs, the barring
status indicating whether communications associated with one or
more of the APNs should be barred by the UE; and means for
refraining from transmitting requests to the network, from a
particular application associated with the UE, when a current
barring status of the APN associated with the particular
application indicates that communications should be barred.
[0028] In yet another possible implementation, UE may comprise:
means for determining an EPS bearer barring status associated with
the EPS bearer connections, the EPS bearer barring status
indicating whether communications associated with one or more EPS
bearer connections should be barred by the UE; means for receive an
indication, from the network, of whether EPS bearer barring should
be active; and means for blocking communications, requested by a
particular application associated with the UE, when an EPS bearer
barring status of the EPS bearer connection associated with the
particular application indicates that communications should be
barred and when EPS bearer barring was indicated as being active
for the network.
[0029] FIG. 1A is a diagram illustrating an example of an overview
of concepts described herein, in which network activity is limited
based on APNs (APN barring). As shown, a wireless network may
connect user equipment (UE), such as a smart phone or other mobile
communication device, to one or more packet data networks (PDNs).
PDN gateway (PGWs) may implement interfaces between the wireless
network and the PDNs. To implement a communication session with a
PDN, the UE may initiate a request, associated with a particular
APN, to the wireless network. In response, the wireless network may
use the APN to determine the PGW/PDN associated with the request
and to determine whether the communication request is allowed for
the mobile device.
[0030] Consistent with aspects described herein, the UE may
associate APNs with different applications and/or application types
or categories. The UE may maintain a mapping of the APNs to
applications installed at the UE and/or to application categories
or types. The associations may be statically defined in the UE or
dynamically configured by a network operator. In this example,
"APN1" is associated with the application category "email traffic";
"APN2" is associated with the application category "video traffic";
and "APN3" is associated with the specific application "message
board application." The "message board application" may be, for
example, a public safety application that is installed, by the
network operator, on all UEs. In times of natural disasters (e.g.,
earthquakes, hurricanes, etc.) the message board application may be
an application through which users can post their statuses (e.g.,
"not hurt") for the benefit of friends and family. It may be
desirable that traffic relating to the message board application
always be given high priority by the network operator, particularly
during the occurrence of network congestion and/or natural
disasters. In contrast, a particular network operator may decide to
give email and video traffic lower priority during periods of
congestion or natural disasters.
[0031] The UE may prohibit or allow, based on the APN associated
with a particular application or application category, the
initiation (or continuation) of communication sessions with the
PDNs. For example, the UE may maintain a list of APNs that are
barred during congestion periods. In response to an indication from
the wireless network of congestion, the UE may deny communication
sessions associated with the any of the APNs in the list. As
another example, the UE may maintain a "whitelist" of APNs that are
permitted during periods of congestion. During congestion, the UE
may deny communication sessions associated with any APNs that are
not in the whitelist. As yet another example, whenever a UE
establishes an initial communication session for a given APN, the
wireless network may indicate whether communication is permitted
for the given APN during periods of congestion. In some
implementations, APNs may be associated with priority values or
congestion levels. A current network priority value or congestion
level may be compared, by the UE, to the APN priority value or
congestion level to determine whether to permit communication via
the APN.
[0032] In the example of FIG. 1A, assume that the occurrence of a
congestion event or other event (e.g., natural disaster) is
signaled to the UE with an indication that APN barring is to be
applied. In response, the UE may determine that APN1 and APN2 are
barred and that communication sessions associated with APN3 are
permitted. In this example, email traffic and video traffic may
thus be blocked (indicated by an "X" in FIG. 1A) and traffic
associated with the "message board application" permitted.
[0033] FIG. 1B is a diagram illustrating an example of an overview
of concepts described herein in which ACDC is implemented via
bearer barring. In the example of FIG. 1B, the UE may associate EPS
bearers with different applications and/or application types or
categories. The UE may maintain a mapping of the EPS bearers to
applications. In this example, "Bearer1" is associated with the
application category "email traffic"; "Bearer2" is associated with
the application category "video traffic"; and "Bearer3" is
associated with the specific application "message board
application."
[0034] During operation, the wireless network may signal the
barring status (e.g., bar or allow) of the EPS bearers. For
example, the wireless network may indicate that, during periods of
congestion, "Bearer1" and "Bearer2" are to be barred and "Bearer3"
is to be allowed. During a congestion period, the UE may
accordingly bar applications associated with "Bearer1" and
"Bearer2" from initiating network communications.
[0035] FIG. 2 is a diagram of an example environment 200 in which
systems and/or methods described herein may be implemented. As
illustrated, environment 200 may include one or more UEs 210
(referred to singularly as UE 210 or collectively as UEs 210),
which may obtain network connectivity through, for example,
wireless network 220. Wireless network 220 may provide access to
one or more external networks, each labeled as packet data network
(PDN) 250. The wireless network may include access network 230 and
core network 240. Access network 230 may, in some implementations,
be associated with a network operator that controls or otherwise
manages core network 240. Core network 240 may include an Internet
Protocol (IP)-based network, such as System Architecture Evolution
(SAE) core network or a General Packet Radio Service (GPRS) core
network.
[0036] UE 210 may include a portable computing and communication
device, such as a personal digital assistant (PDA), a smart phone,
a cellular phone, a laptop computer with connectivity to a cellular
wireless network, a tablet computer, etc. UE 210 may also include
non-portable computing devices, such as desktop computers, consumer
or business appliances, or other devices that have the ability to
wirelessly connect to access network 230.
[0037] Access network 230 may represent a 3GPP access network that
includes one or more access technologies. Access network 230 may
include base stations 232 and mobility management entity (MME) 234.
In the context of an LTE-based access network, base stations 232
may each be referred to as an evolved NodeB (eNodeB) 232. Core
network 240 may include an IP-based network. In the 3GPP network
architecture, core network 240 may include an Evolved Packet Core
(EPC). As illustrated, core network 240 may include serving gateway
(SGW) 242 and packet data network gateways (PGW) 246. Although
certain network devices are illustrated in environment 200 as being
part of access network 230 and core network 240, whether a network
device is labeled as being in the "access network" or the "core
network" of environment 200 may be an arbitrary decision that may
not affect the operation of wireless network 220.
[0038] ENodeBs 232 may each provide a radio interface over which
the eNodeB may communicate with UEs 210. The radio interface may
include a radio interface that implements, for example, an evolved
UMTS (Universal Mobile Telecommunications System) Terrestrial Radio
Access (E-UTRA) network.
[0039] MME 234 may include one or more computation and
communication devices that perform operations to register UEs 210
with core network 240, establish bearer channels associated with a
session with UEs 210, hand off UEs 210 from one eNodeB to another,
and/or perform other operations. MME 234 may generally handle
control plane traffic. SGW 242 may include one or more network
devices that aggregate traffic received from one or more eNodeBs
232. SGW 242 may generally handle user (data) plane traffic.
[0040] PGW 246 may include one or more devices that act as the
point of interconnect between core network 240 and external IP
networks, such as PDNs 250, and/or operator IP services. PGW 246
may route packets to and from the access networks and the external
IP networks.
[0041] PDNs 250 may each include packet-based networks. PDNs 250
may include external networks, such as a public network (e.g., the
Internet) or proprietary networks that provide services that are
provided by the operator of core network 240 (e.g., IP multimedia
(IMS)-based services, transparent end-to-end packet-switched
streaming services (PSSs), or other services).
[0042] The quantity of devices and/or networks, illustrated in FIG.
2, is provided for explanatory purposes only. In practice, there
may be additional devices and/or networks; fewer devices and/or
networks; different devices and/or networks; or differently
arranged devices and/or networks than illustrated in FIG. 2.
Alternatively, or additionally, one or more of the devices of
environment 200 may perform one or more functions described as
being performed by another one or more of the devices of
environment 200.
[0043] As previously mentioned, in one implementation, APN barring
may be used to implement ACDC by limiting, on a per-application or
per-application category basis, access to certain APNs.
[0044] An APN may provide a logical identification of a PDN and/or
PGW that UE 210 is to communicate with to obtain network services.
UE 210, when making a data connection, may be configured with an
APN to present to wireless network 220. Wireless network 220 may
examine the APN to determine what type of network connection should
be created, for example: what IP addresses should be assigned to UE
210, what security methods should be used, and how or if, UE 210
should be connected to a customer network. In addition to
identifying a PDN, an APN may also be used to define the type of
service, (e.g. connection to wireless application protocol (WAP)
server, multimedia messaging service (MMS)) that is provided by the
PDN).
[0045] As defined in the 3GPP TS 24.008 specification, section
10.5.6.1, an APN may be a label or a fully qualified domain name
according to the Domain Name System (DNS) naming conventions. An
APN label may have a minimum length of three octets and a maximum
length of 102 octets. As an example of the use of an APN, UE 210,
when attaching to wireless network 220, may initially connect to
one of PDNs 250 based on the default APN that is configured for UE
210. Different applications and/or application types, that are
executed by UE 210, may be associated with different APNs.
[0046] FIGS. 3A-3C are diagrams illustrating the mapping of
applications and/or application categories with APNs. The mappings
shown in FIGS. 3A-3C may be performed at the UE application level,
which may allow for the UE NAS (non-access stratum) and AS (access
stratum) functional protocol layers to be application unaware,
since the mapping at the application level may be transparent to
the UE NAS and AS layers. The mappings shown in FIGS. 3A-3C may be
stored by UEs 210, such as via static storage that is configured
during manufacture or provisioning of UEs 210, or may be
dynamically received, such as through over the air (OTA)
techniques, from wireless network 220. The mappings shown in FIGS.
3A-3C may be stored by UEs 210 using one or more data
structures.
[0047] As illustrated in FIG. 3A, applications may be associated
with (e.g., mapped to) particular APNs. An application, in this
context, may refer to a particular application, such as an
application published by a particular developer or other entity and
that is installed by a user of UE 210, and/or an application that
is installed during manufacture or provisioning of UE 210. Each
application may be uniquely identified, such as by a value assigned
to the application (e.g., a value generated by a hash of the
application's code), a title of the application, or by another
value. In FIG. 3A, each of a number of APNs, labeled as APN_1
through APN_N, are illustrated as being associated with
applications. In particular, APN_1 is associated with the
applications labeled as Application_1 through Application_X; APN_2
is associated with the applications labeled as Application_X+1
through Application_Y; and APN_N is associated with the
applications labeled as Application_Y+1 through Application_Z. The
variables N, X, Y, and Z may represent positive integers.
[0048] As illustrated in FIG. 3B, in some implementations,
applications may be mapped, based on corresponding application
categories, with particular APNs. An application category may
represent the type of an application based on the functionality of
the application (e.g., email, video conferencing, gaming, etc.) or
the type of the network traffic used by the application (e.g., a
priority or guaranteed bandwidth used by bearer connections
associated with applications). With the associations shown in FIG.
3B, different applications may be associated with particular APNs
based on the application category corresponding to the different
applications. For instance, APN_1 is associated with the
application categories labeled as App_Category_1 through
App_Category_X; APN_2 is associated with the application categories
labeled as App_Category_X+1 through App_Category_Y; and APN_N is
associated with the application categories labeled as
App_Category_Y+1 through App_Category_Z.
[0049] As illustrated in FIG. 3C, in one implementation,
applications may be mapped to APNs based on a hierarchical
association that includes application categories (or
sub-categories) and specific applications. In this implementation,
UE 210 may include associations of both specific applications to
APNs (e.g., as illustrated in FIG. 3A) and associations of
application categories to APNs (e.g., as illustrated in FIG. 3B).
The application categories may be further divided into
sub-categories. For example, a "video traffic" category may include
the sub-categories "streaming media video" and "two-way
teleconferencing video." Applications may be assigned to categories
based on the first matching one of: specific application
identifier, application-sub category, and application category. In
other words, if a particular application is specifically indicated
as corresponding to an APN, the particular application may be
associated with the APN. If the particular application is not
specifically indicated as corresponding to any APN, but the
particular application is associated with a sub-category, the
particular application may be associated with the APN based on the
sub-category. Otherwise, the particular application may be
associated with the APN based on the category.
[0050] As illustrated in FIG. 3C, APNs 1 through N are associated
with applications Application_1 through Application_Z. Application
sub-categories (App_Sub_Cat_1 through App_Sub_Cat_K,
App_Sub_Cat_K+1 through App_Sub_Cat_L, and App_Sub_Cat_L+1 through
App_Sub_Cat_M) and categories (App_Category_1, App_Category_2, and
App_Category_N) are also associated with the APNs. For instance, as
shown, the first application category (App_Category_1) may be
associated with the sub-categories App_Sub_Cat_1 through
App_Sub_Cat_K. App_Sub_Cat_1 may include the applications
Application_1 and Application_2. App_Sub_Cat_K may include the
application Application_X. App_Category_1, App_Sub_Cat_1 through
App_Sub_Cat_K, and Application_1 through Application_X may all map
to the APN labeled as APN_1.
[0051] FIG. 4 is a flowchart illustrating an example of a process
400 relating to APN barring. Process 400 may be performed by, for
example, UE 210.
[0052] Process 400 may include configuring the UE with APN to
application mappings (block 410). The APN to application mappings
may be stored by UE 210 as one or more data structures, such as
those illustrated with respect to FIGS. 3A-3C. UE 210 may obtain
the mappings during manufacture or provisioning of UE 210 and/or
the mappings may be dynamically received or updated, such as
through OTA techniques.
[0053] Process 400 may further include receiving network state
information indicating whether APN barring is active (block 420).
In one implementation, network 220, such as MME 234 or SGW 242 of
network 220, may explicitly indicate, such as via a System
Information Block message, or another message type, when APN
barring is to be active. In some implementations, APN barring may
be made active based on the satisfaction of another condition. For
example, UE 210 may receive an indication that APN barring is to be
activated whenever network 220 is congested, such as whenever
eNodeB 232 indicates, to UE 210, the radio access network is in a
congestion state.
[0054] In some implementations, the barring status relating to
whether APN barring is active, instead of being received as a
Boolean value indicating whether APN barring is active or not
active, may be received as another value, such as a probability of
performing APN barring or a time period over which APN barring is
to be active. With respect to receiving the APN barring status as a
probability, UE 210 may generate a random number and compare the
random number to the received probability value to indicate whether
APN barring is to be active for the specific UE.
[0055] Process 400 may further include, when a request to the
network is initiated at the UE when APN barring is active,
determining the APN associated with the request (block 430). A
request to the network may refer to a data connection or session
that is requested by an application executing at UE 210.
Alternatively or additionally, in some implementations, in response
to a determination that APN barring is to be set to active, ongoing
network sessions may be subject to APN barring restrictions. The
APN may be determined by the application to APN mappings (or the
application category/sub-category mappings) with which UE 210 is
configured (e.g., as illustrated in FIGS. 3A-3C).
[0056] Process 400 may further include permitting or barring the
request to the network based on the determined APN (block 440). For
example, in one implementation, during periods of network
congestion, only certain APNs may be permitted. Application
requests, to the network, associated with other APNs may be barred
(i.e., UE 210 may refrain from transmitting a request to wireless
network 220). By refraining from transmitting the request to the
network, network load may not affected by requests generated at the
application layer of UE 210. Advantageously, process 400 may
generally operate to reduce power consumption of UE 210, optimize
network usage, and/or maximize cell capacity of wireless network
220 (when wireless network 220 includes a cellular radio access
network).
[0057] Consistent with aspects described herein, a number of
techniques may be used to perform blocks 430 and 440 of process
400. These techniques will be discussed in more detail below with
reference to FIGS. 5-9.
[0058] FIG. 5 is a diagram conceptually illustrating APN barring
using an enumeration of barred APNs. As illustrated in FIG. 5,
wireless network 220 may transmit a list (or other data structure)
of barred APNs to UE 210. The list of barred APNs may be
transmitted, for example, by eNodeB 232, MME 234, or another
network device. The list of APNs to be barred during congestion
maybe be pre-configured in the UE. The list of barred APNs may
define APNs for which UE 210 will not establish a new PDN
connection or initiate any communication via an existing PDN
connection.
[0059] In one implementation, the list of barred APNs may be
broadcast to UEs 210 in response to the occurrence of congestion.
The list of barred APNs may be broadcast as a list that includes a
fully qualified domain name (potentially including a delimiter
between APNs) of each APN. Alternatively, to potentially reduce the
size of the list of barred APNs, only a portion, such as a prefix
portion, may be transmitted for each APN. For example, for an APN
corresponding to an IMS PDN connection, the complete APN may be of
the form "IMS.operatorname.x.y". For this APN, the "IMS" portion of
the APN may be the distinguishing portion of the APN name and
"operatorname.x.y" may be omitted in the transmitted list of barred
APNs. UE 210 may reconstruct the full APN from the received portion
of the APN.
[0060] In another possible implementation, instead of broadcasting
the list of barred APNs in response to the occurrence of
congestion, the list of barred APNs may be transmitted to UE 210
ahead of time, such as by UE 210 downloading the list of barred
APNs via OTA or OMA-DA updates. Wireless network 220 may notify UE
whenever APN barring is to be activated (e.g., when there is
congestion). UE 210 may then proceed to bar access to all APNs in
the previously received list of barred APNs. In one implementation,
the indication that APN barring is to be activated may be
transmitted to UE 210 as part of a System Information Block Type 2
message, as defined in the technical specification 3GPP TS 36.331.
For example, a "Congestion Indication Field," having a Boolean
value, may be added to this message.
[0061] UE 210, when receiving the list of barred APNs, may save the
list of barred APNs as the most current list of barred APNs. If APN
barring is subsequently activated, such as during a period of
congestion, the list of barred APNs may be used by UE 210 to bar
any requests to the network that are associated with applications
that map to an APN in the barred list of APNs.
[0062] In one implementation, UE 210 may be pre-configured with
APNs, relevant for the public land mobile network (PLMN), that are
associated with UE 210, where each of the APNs may be associated
with an index value. The indexes for the APNs may be, for example,
initially set in UE 210 (e.g., during provisioning) and updated via
OTA updates, OMA-DM (Open Mobile Alliance-Device Management)
updates, updates included in NAS messages, or updates that are sent
via SMS (Short Message Service) push messages. In this situation,
the list of barred APNs may be transmitted as a list of the indexes
or a bitmap referring to the indexes.
[0063] In one implementation, the list of barred APNs (e.g., either
a complete list of barred APNs or a list of APN indexes) may be
transmitted to UE 210 as part of a System Information Block Type 2
message. For example, an "APN-Barring-Status" field may be added to
this message. The APN-Barring-Status field may be a bitmap in which
each bit corresponds to an indexed APNs. For instance, a logic one
bit value for a bit may indicate that the corresponding APN is
barred during congestion and a logic zero bit value may indicate
that the corresponding APN is not barred during congestion.
[0064] One possible implementation of a System Information Block
Type 2 message, including an "APN-Barring-Status" field, is
illustrated in Table I. Table II includes field descriptions for
the fields in Table I. In Tables I and II, bold text indicates text
that may be added to the 3GPP TS 36.331 standard to implement the
"APN-Barring-Status" field.
TABLE-US-00001 TABLE I SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2
::= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergency
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OPTIONAL, -- Need OP
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0-IEs) OPTIONAL, -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-Video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC-BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL, -- Need OR
nonCriticalExtension SystemInformationBlockType-v9e0-IEs OPTIONAL
-- Need OP } SystemInformationBlockType2-v9e0-IEs :: = SEQUENCE {
ul-CarrierFreq-v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL, -- Cond
ul-FreqMax nonCriticalExtension SEQUENCE { } OPTIONAL -- Need OP }
AC-BarringConfig :: = SEQUENCE { ac-BarringFactor ENUMERATED { p00,
p05, p10, p15, p20, p25, p30, p40, p50, p60, p70, p75, p80, p85,
p90, p95}, ac-BarringTime ENUMERATED {s4 , s8 , s16, s32 , s64,
s128, s256, s512}, ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN-SubframeConfig
SystemInformationBlockType2-v13xx-IEs ::= SEQUENCE {
Apn-BarringStatus BIT STRING (SIZE (maxAPN)) OPTIONAL-- Need OP
nonCriticalExtension SEQUENCE { } OPTIONAL-- Need OP }
TABLE-US-00002 TABLE II SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, . . . , p95 = 0.95. Values other than p00
can only be set if all bits of the corresponding
ac-BarringForSpecialAC are set to 0. ac-BarringForCSFB Access class
barring for mobile originating CS fallback. ac-BarringForEmergency
Access class barring for AC 10. ac-BarringForMO-Data Access class
barring for mobile originating calls. ac-BarringForMO-Signalling
Access class barring for mobile originating signalling.
ac-BarringForSpecialAC Access class barring for AC 11-15. The
first/leftmost bit is for AC 11, the second bit is for AC 12, and
so on. ac-BarringTime Mean access barring time value in seconds.
additionalSpectrumEmission The UE requirements related to IE
AdditionalSpectrumEmission are defined in TS 36.101 [42, table
6.2.4.1]. mbsfn-SubframeConfigList Defines the subframes that are
reserved for MBSFN in downlink. multiBandInfoList A list of
additionalSpectrumEmission i.e. one for each additional frequency
band included in multiBandInfoList in SystemInformationBlockType1,
listed in the same order. ssac-BarringForMMTEL-Video Service
specific access class barring for MMTEL video originating calls.
ssac-BarringForMMTEL-Voice Service specific access class barring
for MMTEL voice originating calls. ul-Bandwidth Parameter:
transmission bandwidth configuration, N.sub.RB, in uplink, see TS
36.101 [42, table 5.6-1]. Value n6 corresponds to 6 resource
blocks, n15 to 15 resource blocks and so on. If for FDD this
parameter is absent, the uplink bandwidth is equal to the downlink
bandwidth. For TDD this parameter is absent and it is equal to the
downlink bandwidth. ul-CarrierFreq For FDD: If absent, the
(default) value determined from the default TX-RX frequency
separation defined in TS 36.101 [42, table 5.7.3-1] applies. For
TDD: This parameter is absent and it is equal to the downlink
frequency. Apn-BarringStatus Barring status for each APN. The
first/leftmost bit is for the first APN, the second bit is for the
second APN, and so on. 1 means that the APN is barred during
congestion and 0 means the APN is not barred during congestion.
[0065] One possible implementation of a System Information Block
Type 2 message, including an indication of congestion, is
illustrated in Table III. Table IV includes field descriptions for
the fields in Table III. In Tables III and IV, bold text indicates
text that may be added to the 3GPP TS 36.331 standard to implement
the indication of congestion.
TABLE-US-00003 TABLE III SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2 ::
= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergency
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OPTIONAL, -- Need OP
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0-IEs) OPTIONAL, -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-Video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC-BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL, -- Need OR
nonCriticalExtension SystemInformationBlockType2-v9e0-IEs OPTIONAL
-- Need OP } SystemInformationBlockType2-v9e0-IEs ::= SEQUENCE {
ul-CarrierFreq-v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL -- Cond
ul-FreqMax nonCriticalExtension
SystemInformationBlockType2-v13xx-IEs OPTIONAL -- Need OP }
SystemInformationBlockType2-v12xx-IEs ::= SEQUENCE {
Congestion-indication BOOLEAN OPTIONAL, -- Need OP
nonCriticalExtension SEQUENCE { } OPTIONAL -- Need OP }
AC-BarringConfig ::= SEQUENCE { ac-BarringFactor ENUMERATED { p00,
p05, p10, p15, p20, p25, p30, p40, p50, p60, p70, p75, p80, p85,
p90, p95}, ac-BarringTime ENUMERATED {s4, s8, s16, s32, s64, s128,
s256, s512}, ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN-SubframeConfig
TABLE-US-00004 TABLE IV SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, . . . , p95 = 0.95. Values other than p00
can only be set if all bits of the corresponding
ac-BarringForSpecialAC are set to 0. ac-BarringForCSFB Access class
barring for mobile originating CS fallback. ac-BarringForEmergency
Access class barring for AC 10. ac-BarringForMO-Data Access class
barring for mobile originating calls. ac-BarringForMO-Signalling
Access class barring for mobile originating signalling.
ac-BarringForSpecialAC Access class barring for AC 11-15. The
first/leftmost bit is for AC 11, the second bit is for AC 12, and
so on. Congestion-indication Indication of congestion in the cell.
Value TRUE indicates that there is congestion in the cell. Value
TRUE may trigger the barring of access to some APNs. ac-BarringTime
Mean access barring time value in seconds.
additionalSpectrumEmission The UE requirements related to IE
AdditionalSpectrumEmission are defined in TS 36.101 [42, table
6.2.4.1]. mbsfn-SubframeConfigList Defines the subframes that are
reserved for MBSFN in downlink. multiBandInfoList A list of
additionalSpectrumEmission i.e. one for each additional frequency
band included in multiBandInfoList in SystemInformationBlockType1,
listed in the same order. ssac-BarringForMMTEL-Video Service
specific access class barring for MMTEL video originating calls.
ssac-BarringForMMTEL-Voice Service specific access class barring
for MMTEL voice originating calls. ul-Bandwidth Parameter:
transmission bandwidth configuration, N.sub.RB, in uplink, see TS
36.101 [42, table 5.6-1]. Value n6 corresponds to 6 resource
blocks, n15 to 15 resource blocks and so on. If for FDD this
parameter is absent, the uplink bandwidth is equal to the downlink
bandwidth. For TDD this parameter is absent and it is equal to the
downlink bandwidth. ul-CarrierFreq For FDD: If absent, the
(default) value determined from the default TX-RX frequency
separation defined in TS 36.101 [42, table 5.7.3-1] applies. For
TDD: This parameter is absent and it is equal to the downlink
frequency.
[0066] FIG. 6 is a diagram conceptually illustrating APN barring
using an APN whitelist. As illustrated in FIG. 6, wireless network
220 may transmit a whitelist of APNs to UE 210. The whitelist of
APNs may define APNs that will be allowed by UE 210. In other
words, APNs not on the whitelist may be APNs for which UE 210 may
bar the establishment of a new PDN connection and/or bar the
initiation of communications via an existing PDN connection. In
general, implementing APN barring using a whitelist of APNs may be
implemented similarly to APN barring using the list of barred APNs,
as discussed with respect to FIG. 5, except that the barred APNs
may include any APNs that are not explicitly in the APN
whitelist.
[0067] In one implementation, the whitelist of APNs may be
broadcast to UEs 210 in response to the occurrence of congestion.
As with the list of barred APNs, the whitelist of APNs may be
broadcast as a list that includes a fully qualified domain name of
each APN. Alternatively, to potentially reduce the size of the
whitelist of APNs, only a portion, such as a prefix portion or a
corresponding index value, may be transmitted for each APN.
[0068] In another possible implementation, instead of broadcasting
the whitelist of APNs in response to the occurrence of congestion,
the whitelist of APNs may be transmitted to UE 210 ahead of time,
such as by UE 210 downloading the list of barred APNs via OTA or
OMA-DM updates. Wireless network 220 (e.g., via corresponding UE
232) may notify UE whenever APN barring is to be activated (e.g.,
when there is congestion). The notification may be included as, for
example, a field in a System Information Block Type 2 message. In
another possible implementation, instead of sending the whitelist
of APNs, the whitelist of APNs may be pre-configured in UE 210
during provisioning. The whitelist can then potentially be modified
via OTA (Over The Air) or OMA-DM (Open Mobile Alliance-Device
Management) updates.
[0069] In one implementation, UE 210 may be pre-configured with a
list of indexed APNs relevant for the PLMN that is associated with
UE 210. The list of indexed APNs may be, for example, initially set
in UE 210 (e.g., during provisioning) and updated via OTA updates,
OMA-DM (Open Mobile Alliance Device Management) updates, updates
included in NAS messages, or updates that are sent via SMS (Short
Message Service) push messages. In this situation, the whitelist of
APNs may include a list of indexes or a bitmap referring to the
indexes in the list of indexed APNs. The whitelist of APNs may be
transmitted to UE 210 as part of the System Information Block Type
2 message. For example, an "APN-Whitelist-Status" field may be
added to this message. The APN-Whitelist-Status field may be a
bitmap that includes a bit corresponding to each APN in the list of
indexed APNs. A logic one bit value for a bit may indicate that the
corresponding APN is on the whitelist and a logic zero bit value
may indicate that the corresponding APN is not on the
whitelist.
[0070] Tables V-VIII illustrate examples of System Information
Block Type 2 messages that may be used to implement an example
implementation of APN barring using APN whitelists. Table V
illustrates an example System Information Block Type 2 message that
includes a bitmap field indicating which APNs are allowed, Table VI
illustrates field descriptions for the fields in Table V, Table VI
illustrates an example System Information Block Type 2 message that
includes an indication of APN barring (i.e., indication of
congestion), and table VII illustrates field descriptions for the
fields in Table VI. In Tables V-VIII, bold text indicates text that
may be added to the 3GPP TS 36.331 standard to implement the
indication of congestion.
TABLE-US-00005 TABLE V SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2
::= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergency
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OPTIONAL, -- Need OP
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0- IEs) OPTIONAL, -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-Video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC-BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL -- Need OR nonCriticalExtension
SystemInformationBlockType2-v9e0-IEs OPTIONAL -- Need OP }
SystemInformationBlockType2-v9e0-IEs ::= SEQUENCE {
ul-CarrierFreq-v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL -- Cond ul-
FreqMax nonCriticalExtension SystemInformationBlockType2-v13xx-IEs
OPTIONAL -- Need OP } AC-BarringConfig ::= SEQUENCE {
ac-BarringFactor ENUMERATED { p00, p05, p10, p15, p20, p25, p30,
p40, p50, p60, p70, p75, p80, p85, p90, p95}, ac-BarringTime
ENUMERATED (s4, s8, s16, s32, s64, s128, s256, s512},
ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN- SubframeConfig
SystemInformationBlockType2-v13xx-IEs ::= SEQUENCE { Apn-WhiteList
BIT STRING (SIZE (maxAPN)) OPTIONAL-- Need OP nonCriticalExtension
SEQUENCE { } OPTIONAL-- Need OP } --ASN1STOP
TABLE-US-00006 TABLE VI SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, . . . , p95 = 0.95. Values other than p00
can only be set if all bits of the corresponding
ac-BarringForSpecialAC are set to 0. ac-BarringForCSFB Access class
barring for mobile originating CS fallback. ac-BarringForEmergency
Access class barring for AC 10. ac-BarringForMO-Data Access class
barring for mobile originating calls. ac-BarringForMO-Signalling
Access class barring for mobile originating signalling.
ac-BarringForSpecialAC Access class barring for AC 11-15. The
first/leftmost bit is for AC 11, the second bit is for AC 12, and
so on. ac-BarringTime Mean access barring time value in seconds.
additionalSpectrumEmission The UE requirements related to IE
AdditionalSpectrumEmission are defined in TS 36.101 [42, table
6.2.4.1]. mbsfn-SubframeConfigList Defines the subframes that are
reserved for MBSFN in downlink. multiBandInfoList A list of
additionalSpectrumEmission i.e. one for each additional frequency
band included in multiBandInfoList in SystemInformationBlockType1,
listed in the same order. ssac-BarringForMMTEL-Video Service
specific access class barring for MMTEL video originating calls.
ssac-BarringForMMTEL-Voice Service specific access class barring
for MMTEL voice originating calls. ul-Bandwidth Parameter:
transmission bandwidth configuration, N.sub.RB, in uplink, see TS
36.101 [42, table 5.6-1]. Value n6 corresponds to 6 resource
blocks, n15 to 15 resource blocks and so on. If for FDD this
parameter is absent, the uplink bandwidth is equal to the downlink
bandwidth. For TDD this parameter is absent and it is equal to the
downlink bandwidth. ul-CarrierFreq For FDD: If absent, the
(default) value determined from the default TX-RX frequency
separation defined in TS 36.101 [42, table 5.7.3-1] applies. For
TDD: This parameter is absent and it is equal to the downlink
frequency. Apn-WhiteList Bitmap showing which APNs are allowed,
i.e., which APNs are in the APN white list. The first/leftmost bit
is for the first APN, the second bit is for the second APN, and so
on.
TABLE-US-00007 TABLE VII SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2
::= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergency
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OP OPTIONAL, -- Need
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0- IEs) OPTIONAL, -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-Video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC-BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL, -- Need OR
nonCriticalExtension SystemInformationBlockType2-v9e0-IEs OPTIONAL
-- Need OP } SystemInformationBlockType2-v9e0-IEs ::= SEQUENCE {
ul-CarrierFreq-v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL, -- Cond ul-
FreqMax nonCriticalExtension SystemInformationBlockType2-v13xx-IEs
OPTIONAL -- Need OP } SystemInformationBlockType2-v12xx-IEs ::=
SEQUENCE { Congestion-indication BOOLEAN OPTIONAL, -- Need OP
nonCriticalExtension SEQUENCE { } OPTIONAL -- Need OP }
AC-BarringConfig ::= SEQUENCE { ac-BarringFactor ENUMERATED { p00,
p05, p10, p15, p20, p25, p30, p40, p50, p60, p70, p75, p80, p85,
p90, p95}, ac-BarringTime ENUMERATED (s4, s8, s16, s32, s64, s128,
s256, s512}, ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN- SubframeConfig --ASN1STOP
TABLE-US-00008 TABLE VIII SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, . . . , p95 = 0.95. Values other than p00
can only be set if all bits of the corresponding
ac-BarringForSpecialAC are set to 0. ac-BarringForCSFB Access class
barring for mobile originating CS fallback. ac-BarringForEmergency
Access class barring for AC 10. ac-BarringForMO-Data Access class
barring for mobile originating calls. ac-BarringForMO-Signalling
Access class barring for mobile originating signalling.
ac-BarringForSpecialAC Access class barring for AC 11-15. The
first/leftmost bit is for AC 11, the second bit is for AC 12, and
so on. Congestion-indication Indication of congestion in the cell.
Value TRUE indicates that there is congestion in the cell. Value
TRUE may trigger the barring of access to some APNs. ac-BarringTime
Mean access barring time value in seconds. additionalSpectrum
Emission The UE requirements related to IE
AdditionalSpectrumEmission are defined in TS 36.101 [42, table
6.2.4.1]. mbsfn-SubframeConfigList Defines the subframes that are
reserved for MBSFN in downlink. multiBandInfoList A list of
additionalSpectrumEmission i.e. one for each additional frequency
band included in multiBandInfoList in SystemInformationBlockType1,
listed in the same order. ssac-BarringForMMTEL-Video Service
specific access class barring for MMTEL video originating calls.
ssac-BarringForMMTEL-Voice Service specific access class barring
for MMTEL voice originating calls. ul-Bandwidth Parameter:
transmission bandwidth configuration, N.sub.RB, in uplink, see TS
36.101 [42, table 5.6-1]. Value n6 corresponds to 6 resource
blocks, n15 to 15 resource blocks and so on. If for FDD this
parameter is absent, the uplink bandwidth is equal to the downlink
bandwidth. For TDD this parameter is absent and it is equal to the
downlink bandwidth. ul-CarrierFreq For FDD: If absent, the
(default) value determined from the default TX-RX frequency
separation defined in TS 36.101 [42, table 5.7.3-1] applies. For
TDD: This parameter is absent and it is equal to the downlink
frequency.
[0071] FIG. 7 is a diagram conceptually illustrating APN barring
consistent with another aspect. In the implementation of FIG. 7, an
APN is assigned a barring status (e.g., either to block the APN or
not block the APN when APN barring is active, e.g., during a
congestion situation) during the establishment of a default EPS
bearer for the APN. UE 210 may store the obtained barring status,
for the APN, and subsequently use the barring status, when APN
barring is activated (e.g., during congestion), to determine
whether to permit or bar requests, to the network, associated with
the APN.
[0072] As illustrated in FIG. 7, at some point, such as when a data
connection, associated with a particular APN, is first needed by an
application executed by UE 210, UE 210 may initiate the
establishment of a default bearer connection for UE 210 (at 7.1,
"Default Bearer Configuration for APN"). As part of the
configuration information exchanged for the default bearer
connection, an indication may be provided (at 7.2, "APN Barred
Indication"), to UE 210, of whether UE 210 should bar that APN when
APN barring is active (e.g., during congestion). UE 210 may store
the indication such that UE 210 maintains the indication even when
the UE transitions between idle and active mode.
[0073] In one implementation, the indication of whether the APN
should be barred when APN barring is active, may be provided to UE
210 as a field in the "Activate Default EPS Bearer Context Request"
or the "Activate Dedicated EPS Bearer Context Request" message, as
defined in the specification 3GPP TS 24.301. For example, an "APN
Barring" field, having a Boolean value, may be included in the
Activate Default EPS Bearer Context Request message, to indicate
the APN barring status for the APN (e.g., whether the APN is to be
barred or not barred whenever APN barring is active). The APN
barring status may potentially be changed or reconfigured when the
default bearer for the APN is reconfigured or when the default
bearer is modified using a bearer modification procedure.
[0074] As with the implementations discussed with respect to FIGS.
6 and 7, the indication that APN barring is to be activated may be
transmitted to UE 210 as part of a System Information Block Type 2
message, as defined in the technical specification 3GPP TS 36.331.
For example, a "Congestion Indication Field," having a Boolean
value, may be added to this message.
[0075] Table IX illustrates an example of the above-mentioned "APN
Barring" field, Table X illustrates and example indication of
whether APN barring is to be activated using a System Information
Block Type 2 message, and Table XI illustrates field descriptions
for the fields in Table X. In Tables IX-XI, bold text indicates
text that may be added to the 3GPP TS 36.331 standard to implement
the indication of congestion. In Table IX, the information element
"APN Barring" identifies if the APN should be barred during
congestion. It may be a one bit Boolean value.
TABLE-US-00009 TABLE IX ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST
message, 3 GPP TS 36.331 Information Pres- For- IEI Element
Type/Reference ence mat Length Protocol Protocol M V 1/2
discriminator discriminator 9.2 EPS bearer EPS bearer M V 1/2
identity identity 9.3.2 Procedure Procedure M V 1 transaction
transaction identity identity 9.4 Activate default Message type M V
1 EPS bearer 9.8 context request message identity EPS QoS EPS
quality of M LV 2-14 service 9.9.4.3 Access point Access point M LV
2-101 name name 9.9.4.1 PDN address PDN address M LV 6-14 9.9.4.9
5D Transaction Transaction O TLV 3-4 identifier identifier 9.9.4.17
30 Negotiated QoS Quality of O TLV 14-22 service 9.9.4.12 32
Negotiated LLC LLC service O TV 2 SAPI access point identifier
9.9.4.7 8- Radio priority Radio priority O TV 1 9.9.4.13 34 Packet
flow Packet flow O TLV 3 Identifier Identifier 9.9.4.8 5E APN-AMBR
APN aggregate O TLV 4-8 maximum bit rate 9.9.4.2 58 ESM cause ESM
cause O TV 2 9.9.4.4 27 Protocol Protocol O TLV 3-253 configuration
configuration options options 9.9.4.11 B- Connectivity Connectivity
O TV 1 type type 9.9.4.2A XX APN Barring APN Barring O TV or TLV 1
or 3 9.9.4.X
TABLE-US-00010 TABLE X SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2
::= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergency
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OPTIONAL, -- Need OP
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0- IEs) OPTIONAL, -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-Video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC-BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL, -- Need OR
nonCriticalExtension SystemInformationBlockType2-v9e0-IEs OPTIONAL
-- Need OP } SystemInformationBlockType2-v9e0-IEs ::= SEQUENCE {
ul-CarrierFreq- v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL, -- Cond ul-
FreqMax nonCriticalExtension SystemInformationBlockType2-v13xx-IEs
OPTIONAL -- Need OP } SystemInformationBlockType2-v12xx-IEs ::=
SEQUENCE { Congestion-indication BOOLEAN OPTIONAL, -- Need OP
nonCriticalExtension SEQUENCE { } OPTIONAL -- Need OP }
AC-BarringConfig ::= SEQUENCE { ac-BarringFactor ENUMERATED { p00,
p05, p10, p15, p20, p25, p30, p40, p50, p60, p70, p75, p80, p85,
p90, p95}, ac-BarringTime ENUMERATED {s4, s8, s16, s32, s64, s128,
s256, s512}, ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN- SubframeConfig --ASN1STOP
TABLE-US-00011 TABLE XI SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, . . . , p95 = 0.95. Values other than p00
can only be set if all bits of the corresponding
ac-BarringForSpecialAC are set to 0. ac-BarringForCSFB Access class
barring for mobile originating CS fallback. ac-BarringForEmergency
Access class barring for AC 10. ac-BarringForMO-Data Access class
barring for mobile originating calls. ac-BarringForMO-Signalling
Access class barring for mobile originating signalling.
ac-BarringForSpecialAC Access class barring for AC 11-15. The
first/leftmost bit is for AC 11, the second bit is for AC 12, and
so on. Congestion-indication Indication of congestion in the cell.
Value TRUE indicates that there is congestion in the cell. Value
TRUE may trigger the barring of access to some APNs. ac-BarringTime
Mean access barring time value in seconds.
additionalSpectrumEmission The UE requirements related to IE
AdditionalSpectrumEmission are defined in TS 36.101 [42, table
6.2.4.1]. mbsfn-SubframeConfigList Defines the subframes that are
reserved for MBSFN in downlink. multiBandInfoList A list of
additionalSpectrumEmission i.e. one for each additional frequency
band included in multiBandInfoList in SystemInformationBlockType1,
listed in the same order. ssac-BarringForMMTEL-Video Service
specific access class barring for MMTEL video originating calls.
ssac-BarringForMMTEL-Voice Service specific access class barring
for MMTEL voice originating calls. ul-Bandwidth Parameter:
transmission bandwidth configuration, N.sub.RB, in uplink, see TS
36.101 [42, table 5.6-1]. Value n6 corresponds to 6 resource
blocks, n15 to 15 resource blocks and so on. If for FDD this
parameter is absent, the uplink bandwidth is equal to the downlink
bandwidth. For TDD this parameter is absent and it is equal to the
downlink bandwidth. ul-CarrierFreq For FDD: If absent, the
(default) value determined from the default TX-RX frequency
separation defined in TS 36.101 [42, table 5.7.3-1] applies. For
TDD: This parameter is absent and it is equal to the downlink
frequency.
[0076] FIG. 8 is a diagram conceptually illustrating APN barring
consistent with another aspect. In the implementation of FIG. 8,
instead of assigning APNs based on a Boolean barring status value
(i.e., block or not block the APN), as described with respect to
FIG. 7, the barring status may be assigned as a priority level,
such as an integer value in the range of zero to four (or some
other value). APN barring may be made active by wireless network
220 by transmitting a target priority level to UE 210. APNs that
are associated with a lower priority than the target priority level
may be blocked.
[0077] As illustrated in FIG. 8, at some point, such as when a data
connection, associated with a particular APN, is first needed by an
application executed by UE 210, UE 210 may initiate the
establishment of default bearer connection for UE 210 (at 8.1,
"Default Bearer Configuration for APN"). As part of the
configuration information exchanged for the default bearer
connection, an indication may be provided (at 8.2, "APN Priority
Level"), to UE 210, of the priority level (PL) of the APN
associated with the default bearer connection. In one
implementation, the priority level may be assigned from the range
zero (PL0) to four (PL4), inclusive, where lower values indicate
higher priority. UE 210 may store the priority level for the APN
such that UE 210 maintains the priority level even when the UE
transitions between idle and active mode.
[0078] In one implementation, the indication of the priority level
may be provided to UE 210 as a field in the "Activate Default EPS
Bearer Context Request" or the "Activate Dedicated EPS Bearer
Context Request" message, as defined in the specification 3GPP TS
24.301. For example, an "APN Priority Level" field, having an
integer value specified using up to three bits, may be included in
the "Activate Default EPS Bearer Context Request" message, to
indicate the APN priority level. The APN priority level may
potentially be changed or reconfigured when the default bearer for
the APN is reconfigured or when the default bearer is modified
using a bearer modification procedure.
[0079] The indication that APN barring is to be activated may be
transmitted to UE 210 as part of a System Information Block Type 2
message, as defined in the technical specification 3GPP TS 36.331.
For example, a "Priority Level Indication" field may be set. The
field may include priority value, such as between zero and four,
inclusive, to indicate which APNs are permitted to initiate
communications. In the implementation in which lower values
indicate higher priority, APN communications may only be permitted
by UE 210 if the priority value associated with the APN is less
than or equal to the value of the "Priority Level Indication"
field. In some implementations, the "Priority Level Indication"
field may be set to zero to indicate no congestion (e.g., APN
barring is not active). Alternatively, the "Priority Level
Indication" field may be omitted to indicate no congestion.
[0080] Table XII, below, provides an example of APN priority
levels, assigned to various APNs (APN1, APN2, APN3, and APN4), and
when communication is allowed for the priority level. In Table XII,
the possible APN priority levels may include PL0, PL1, PL2, and
PL3. For example, in the first record of the table, the APN labeled
"APN1" is assigned the priority level PL0, which may mean that no
priority level is associated with this APN (i.e., communication
with this APN is never barred). In the second record of the table,
the APN labeled "APN2" is assigned the priority level PL1, which
may indicate that communications are allowed with the APN whenever
the priority level indication, set by wireless network 220, is
equal to PL1, PL2, or PL3.
TABLE-US-00012 TABLE XII Communication Allowed when Priority Level
Indication sent by the APN APN Priority Level network is APN1 PL0
Any APN2 PL1 PL1, PL2, PL3 APN3 PL2 PL2, PL3 APN4 PL3 PL3
[0081] Table XIII illustrates an example of the above-mentioned
"APN Priority Level" field, Table XIV illustrates an example
indication transmitting APN priority levels, and Table XV
illustrates field descriptions for the fields in Table XIV. In
Tables XIII-XV bold text indicates text that may be added to the
3GPP TS 36.331 or 3GPP TS 24.301 standard to implement the
indication of congestion. In Table XIII, the information element
"APN Priority Level" may be an integer (0 to maxPriorityLevels)
which indicates the priority level of the APN. If an APN has
priority level equal to x, then initial access to connect to the
APN may only be allowed during congestion if the priority level
indicated by the network in Priority-level-indication is equal to
or greater than x. A value of zero may indicate that this APN is
never barred.
TABLE-US-00013 TABLE XIII ACTIVATE DEFAULT EPS BEARER CONTEXT
REQUEST message, 3GPP TS 36.331 Information IEI Element
Type/Reference Presence Format Length Protocol Protocol M V 1/2
discriminator discriminator 9.2 EPS bearer EPS bearer M V 1/2
identity identity 9.3.2 Procedure Procedure M V 1 transaction
transaction identity identity 9.4 Activate Message type M V 1
default 9.8 EPS bearer context request message identity EPS QoS EPS
quality of M LV 2-14 service 9.9.4.3 Access point Access point M LV
2-101 name name 9.9.4.1 PDN address PDN address M LV 6-14 9.9.4.9
5D Transaction Transaction O TLV 3-4 identifier identifier 9.9.4.17
30 Negotiated Quality of O TLV 14-22 QoS service 9.9.4.12 32
Negotiated LLC service O TV 2 LLC access point SAPI identifier
9.9.4.7 8- Radio Radio priority O TV 1 priority 9.9.4.13 34 Packet
flow Packet flow O TLV 3 Identifier Identifier 9.9.4.8 5E APN-AMBR
APN aggregate O TLV 4-8 maximum bit rate 9.9.4.2 58 ESM cause ESM
cause O TV 2 9.9.4.4 27 Protocol Protocol O TLV 3-253 configuration
configuration options options 9.9.4.11 B- Connectivity Connectivity
O TV 1 type type 9.9.4.2A XY APN Priority APN Barring O TV or TLV 1
or 3 Level 9.9.4.X
TABLE-US-00014 TABLE XIV SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2
::= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergeney
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OPTIONAL, -- Need OP
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0- IEs) OPTIONAL -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-Video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC- BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL, -- Need OR
nonCriticalExtension SystemInformationBlockType2-v9e0-IEs OPTIONAL
-- Need OP } SystemInformationBlockType2-v9e0-IEs ::= SEQUENCE {
ul-CarrierFreq-v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL, -- Cond ul-
FreqMax nonCriticalExtension SystemInformationBlockType2-v13xx-IEs
OPTIONAL -- Need OP } SystemInformationBlockType2-v13xx-IEs ::=
SEQUENCE { Priority-level-indication Integer (0 to
maxPriorityLevels) OPTIONAL, -- Need OP nonCriticalExtension
SEQUENCE { } OPTIONAL -- Need OP } AC-BarringConfig ::= SEQUENCE {
ac-BarringFactor ENUMERATED { p00, p05, p10, p15, p20, p25, p30,
p40, p50, p60, p70, p75, p80, p85, p90, p95}, ac-BarringTime
ENUMERATED {s4, s8, s16, s32, s64, s128, s256, s512},
ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN- SubframeConfig --ASN1STOP
TABLE-US-00015 TABLE XV SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, . . . , p95 = 0.95. Values other than p00
can only be set if all bits of the corresponding
ac-BarringForSpecialAC are set to 0. ac-BarringForCSFB Access class
barring for mobile originating CS fallback. ac-BarringForEmergency
Access class barring for AC 10. ac-BarringForMO-Data Access class
barring for mobile originating calls. ac-BarringForMO-Signalling
Access class barring for mobile originating signalling.
ac-BarringForSpecialAC Access class barring for AC 11-15. The
first/leftmost bit is for AC 11, the second bit is for AC 12, and
so on. Priority-level-indication This field is sent during
congestion. It indicates which APNs the UE can initiate
communication with based on the APNPriorityLevel. A
priority-level-indication = x, indicates that initial access to
connect to an APN is only allowed if the APNPriorityLevel is equal
to or less than x. A value of zero may indicate no congestion
situation or the field can be optional and when not present that
means there is no congestion There are up to maxPriorityLevels in
the cell. ac-BarringTime Mean access barring time value in seconds.
additionalSpectrumEmission The UE requirements related to IE
AdditionalSpectrumEmission are defined in TS 36.101 [42, table
6.2.4.1]. mbsfn-SubframeConfigList Defines the subframes that are
reserved for MBSFN in downlink. multiBandInfoList A list of
additionalSpectrumEmission i.e. one for each additional frequency
band included in multiBandInfoList in SystemInformationBlockType1,
listed in the same order. ssac-BarringForMMTEL-Video Service
specific access class barring for MMTEL video originating calls.
ssac-BarringForMMTEL-Voice Service specific access class barring
for MMTEL voice originating calls. ul-Bandwidth Parameter:
transmission bandwidth configuration, N.sub.RB, in uplink, see TS
36.101 [42, table 5.6-1]. Value n6 corresponds to 6 resource
blocks, n15 to 15 resource blocks and so on. If for FDD this
parameter is absent, the uplink bandwidth is equal to the downlink
bandwidth. For TDD this parameter is absent and it is equal to the
downlink bandwidth. ul-CarrierFreq For FDD: If absent, the
(default) value determined from the default TX-RX frequency
separation defined in TS 36.101 [42, table 5.7.3-1] applies. For
TDD: This parameter is absent and it is equal to the downlink
frequency.
[0082] FIG. 9 is a diagram conceptually illustrating APN barring
consistent with another aspect. In the implementation of FIG. 9,
when the default EPS bearer for a given APN is configured, levels
of acceptable congestion may be enumerated for the APN. When APN
barring is active (e.g., when there is congestion), wireless
network 220 may indicate the congestion level (CL) to UEs 210. A UE
210 may bar communication requests associated with APNs that are
not associated with the congestion level indicated by wireless
network 220.
[0083] As illustrated in FIG. 9, at some point, such as when a data
connection, associated with a particular APN, is first needed by an
application executed by UE 210, UE 210 may initiate the
establishment of default bearer connection for UE 210 (at 9.1,
"Default Bearer Configuration for APN"). As part of the
configuration information exchanged for the default bearer
connection, one or more congestion levels may be provided (at 9.2,
"Allowed Congestion Levels") to UE 210. UE 210 may associated the
provided congestion levels with the APN corresponding to the bearer
connection. In one implementation, the congestion levels may be
assigned from the range zero (CL0) to four (CL3), and an APN may be
associated with multiple congestion levels. UE 210 may store the
congestion level(s) for the APN such that UE 210 maintains the
congestion levels even when the UE transitions between idle and
active mode.
[0084] In one implementation, the congestion levels may be provided
to UE 210 as a field in the "Activate Default EPS Bearer Context
Request" or the "Activate Dedicated EPS Bearer Context Request"
message, as defined in the specification 3GPP TS 24.301. For
example, an "APN Congestion Levels Allowed" field may enumerate the
congestion levels assigned to the APN. Alternatively, the "APN
Congestion Levels Allowed" field may be implemented as a bitmap in
which different bits in the bitmap correspond to different
congestion levels. For example, for the congestion levels CL0-CL3,
a four-bit bitmap may be used, in which each bit indicates whether
a particular congestion level is assigned to the APN. Communication
requests to connect to the APN may only be allowed when there is no
congestion or when the network congestion level is equal to one of
the values assigned to the APN.
[0085] The indication that APN barring is to be activated may be
transmitted to UE 210 as part of a System Information Block Type 2
message, as defined in the technical specification 3GPP TS 36.331.
For example, a "Congestion Level Indication" field may be set when
APN barring is to be active, such as when there is congestion. This
field may include an indication of a congestion level in a cell
associated with UE 210. A congestion level of zero (or some other
value) may indicate that there is no congestion in the cell (i.e.,
APN barring is not active).
[0086] Table XVI, below, provides an example of APN congestion
levels, assigned to various APNs (APN1, APN2, APN3, and APN4). In
Table XVI, the possible congestion level values may include CL0,
CL1, CL2, and CL3. Communication may be allowed for any APN that is
assigned a congestion level that matches the congestion level
indicated by wireless network 220. For example, in the first record
of the table, the APN labeled "APN1" is assigned the congestion
level CL0, which may mean that communication with this APN is
barred unless the network congestion level is CL0 (i.e., no
congestion). In the second record of the table, the APN labeled
"APN2" is assigned the congestion levels CL0 and CL2, which may
mean that communication with this APN is barred unless the network
congestion level is CL0 or CL2.
TABLE-US-00016 TABLE XVI APN Congestion Levels Assigned to the APN
APN1 CL0 APN2 CL0, CL2 APN3 CL0, CL1 APN4 CL0, CL1, CL2, CL3
[0087] Table XVII illustrates an example of the above-mentioned
"APN Congestion Levels Allowed" field, Table XVIII illustrates an
example indication of transmitting APN congestion levels, and Table
XIX illustrates field descriptions for the fields in Table XVIII.
In Tables XVII-XIX bold text indicates text that may be added to
the 3GPP TS 36.331 or 3GPP TS 24.301 standard to implement the
indication of congestion. In Table XVII, the information element
"APN Congestion Level Allowed" may be a bitmap with the number of
congestions levels or it could be an enumeration of the allowed
congestion levels. Initial accesses to connect to the APN may be
allowed if there is no congestion or if the congestion level in the
cell indicated in Congestion-level-indication is equal to
one of the configured values.
TABLE-US-00017 TABLE XVII ACTIVATE DEFAULT EPS BEARER CONTEXT
REQUEST message, 3GPP TS 36.331 Information IEI Element
Type/Reference Presence Format Length Protocol Protocol M V 1/2
discriminator discriminator 9.2 EPS bearer EPS bearer M V 1/2
identity identity 9.3.2 Procedure Procedure M V 1 transaction
transaction identity identity 9.4 Activate default Message type M V
1 EPS bearer 9.8 context request message identity EPS QoS EPS
quality of M LV 2-14 service 9.9.4.3 Access point Access point M LV
2-101 name name 9.9.4.1 PDN address PDN address M LV 6-14 9.9.4.9
5D Transaction Transaction O TLV 3-4 identifier identifier 9.9.4.17
30 Negotiated QoS Quality of O TLV 14-22 service 9.9.4.12 32
Negotiated LLC LLC service O TV 2 SAPI access point identifier
9.9.4.7 8- Radio priority Radio priority O TV 1 9.9.4.13 34 Packet
flow Packet flow O TLV 3 Identifier Identifier 9.9.4.8 5E APN-AMBR
APN aggregate O TLV 4-8 maximum bit rate 9.9.4.2 58 ESM cause ESM
cause O TV 2 9.9.4.4 27 Protocol Protocol O TLV 3-253 configuration
configuration options options 9.9.4.11 B- Connectivity Connectivity
O TV 1 type type 9.9.4.2A XZ APN APN O TLV 3-n Congestion
Congestion Levels Allowed Levels Allowed 9.9.4.X
TABLE-US-00018 TABLE XVIII SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2
::= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergency
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OPTIONAL, -- Need OP
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0- IEs) OPTIONAL, -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC-BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL, -- Need OR
nonCriticalExtension SystemInformationBlockType2-v9e0-IEs OPTIONAL
-- Need OP } SystemInformationBlockType2-v9e0-IEs ::= SEQUENCE {
ul-CarrierFreq-v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL, -- Cond ul-
FreqMax nonCriticalExtension SystemInformationBlockType2-v13xx-IEs
OPTIONAL -- Need OP } SystemInformationBlockType2-v13xx-IEs ::=
SEQUENCE { Congestion-level-indication Integer (0 to
maxCongestionLevels) OPTIONAL, -- Need OP nonCriticalExtension
SEQUENCE { } OPTIONAL -- Need OP } AC-BarringConfig ::= SEQUENCE {
ac-BarringFactor ENUMERATED { p00, p05, p10, p15, p20, p25, p30,
p40, p50, p60, p70, p75, p80, p85, p90, p95}, ac-BarringTime
ENUMERATED (s4, s8, s16, s32, s64, s128, s256, s512}.
ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN- SubframeConfig --ASN1STOP
TABLE-US-00019 TABLE XIX SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, ..., p95 = 0.95. Values other than p00 can
only be set if all bits of the corresponding ac-BarringForSpecialAC
are set to 0. ac-BarringForCSFB Access class barring for mobile
originating CS fallback. ac-BarringForEmergency Access class
barring for AC 10. ac-BarringForMO-Data Access class barring for
mobile originating calls. ac-BarringForMO-Signalling Access class
barring for mobile originating signalling. ac-BarringForSpecialAC
Access class barring for AC 11-15. The first/leftmost bit is for AC
11, the second bit is for AC 12, and so on.
Congestion-level-indication Indication of congestion level in the
cell. There are up to maxCongestionLevels in the cell. Congestion-
level-indication of 0 means no congestion. ac-Barring Time Mean
access barring time value in seconds. additionalSpectrumEmission
The UE requirements related to IE AdditionalSpectrumEmission are
defined in TS 36.101 [42, table 6.2.4.1]. mbsfn-SubframeConfigList
Defines the subframes that are reserved for MBSFN in downlink.
multiBandInfoList A list of additionalSpectrumEmission i.e. one for
each additional frequency band included in multiBandInfoList in
SystemInformationBlockType1, listed in the same order.
ssac-BarringForMMTEL-Video Service specific access class barring
for MMTEL video originating calls. ssac-BarringForMMTEL-Voice
Service specific access class barring for MMTEL voice originating
calls. ul-Bandwidth Parameter: transmission bandwidth
configuration, N.sub.RB, in uplink, see TS 36.101 [42, table
5.6-1]. Value n6 corresponds to 6 resource blocks, n15 to 15
resource blocks and so on. If for FDD this parameter is absent, the
uplink bandwidth is equal to the downlink bandwidth. For TDD this
parameter is absent and it is equal to the downlink bandwidth.
ul-CarrierFreq For FDD: If absent, the (default) value determined
from the default TX-RX frequency separation defined in TS 36.101
[42, table 5.7.3-1] applies. For TDD: This parameter is absent and
it is equal to the downlink frequency.
[0088] In the description above, barring of network communications
was described based on APN-based barring techniques. In some
situations, multiple bearers, such as multiple EPS bearers, may be
associated with the same APN. In this case, APN prioritization or
other APN-based barring may not provide enough granularity in
selecting which communications to bar. Additional granularity may
be provided by barring communication sessions based on the bearer
connection, such as based on an EPS bearer. Barring communications
based on EPS bearers will be described below with reference to
FIGS. 10A, 10B, and 11.
[0089] To perform EPS bearer barring, UE 210 may store mappings of
EPS bearers to applications and/or a mapping of EPS bearers to
APNs. FIGS. 10A and 10B are diagrams illustrating mappings that may
be stored by UEs 210. The mappings shown in FIGS. 10A and 10B may
be stored by UEs 210 via static storage that is configured during
manufacture or provisioning of UEs 210. Alternatively or
additionally, the mappings may be obtained, by UE 210, via dynamic
techniques, such as through over the air (OTA) techniques, from
wireless network 220. The mappings shown in FIGS. 10 and 10B may be
stored by UEs 210 using one or more data structures.
[0090] As illustrated in FIG. 10A, applications may be associated
with particular bearers, such as EPS bearers. In FIG. 10A, each of
a number of bearers, labeled as Bearer_1 through Bearer_N, are
illustrated as being associated with a number of applications and
application sub-categories. For example, as shown, Bearer_1 is
associated with the application sub-categories labeled as
App_Sub_Cat_1 through App_Sub_Cat_K. App_Sub_Cat_1 may include the
applications labeled as Application_1 and Application_2, and
App_Sub_Cat_K may include the include the application labeled as
Application_X. The association of application to categories and
sub-categories may be similar to that described previously with
respect to FIGS. 3A-3C. For instance, applications may be assigned
to bearers based on the first matching one of a specific
application identifier or the application-sub category. In other
words, if a particular application is specifically indicated as
corresponding to a bearer, the particular application may be
associated with the bearer. If the particular application is not
specifically indicated as corresponding to any bearer, but the
particular application is associated with a sub-category, the
particular application may be associated with the bearer based on
the sub-category. The use of categories or sub-categories may be
desirable if multiple applications can use the same bearer.
[0091] As illustrated in FIG. 10B, bearers may also be associated
with APNs. In FIG. 10B, each of a number of APNs, labeled as APN_1
through APN_N, are illustrated as being associated with a number of
bearers. In particular, APN_1 is associated with a default bearer
for the APN, Default_Bearer_1, and the dedicated bearers labeled as
Dedicated_Bearer_1,1 through Dedicated_Bearer_1,X. Similarly, APN_2
is associated with a default bearer for the APN, Default_Bearer_2,
and the dedicated bearers labeled as Dedicated_Bearer_2,1 through
Dedicated_Bearer_2,Y; APN_3 is associated with a default bearer for
the APN, Default_Bearer_N, and the dedicated bearers labeled as
Dedicated_Bearer_N,1 through Dedicated_Bearer_N,Z.
[0092] FIG. 11 is a flowchart illustrating an example of a process
1100 relating to EPS bearer barring. Process 1100 may be performed
by, for example, UE 210.
[0093] Process 1100 may include obtaining bearer to application
mappings (block 1110). The bearer to application mappings may be
dynamically (on-the-fly) obtained and stored by UE 210 as bearers
are established for applications. The mappings may be stored as one
or more data structures, such as those illustrated with respect to
FIGS. 10A and 10B.
[0094] Process 1100 may further include receiving information
indicating which EPS bearers are allowed or barred (block 1120).
The information may thus indicate the barring status of the EPS
bearers. The information can be transmitted using a broadcast
message or a non-broadcast (e.g., dedicated unicast message), such
as a message that includes a list of barred EPS bearers. The EPS
bearers may be identified by EPS bearer identification (ID)
values.
In one implementation, the information indicating which bearers are
allowed or barred may be communicated during an extended service
request and tracking area update procedure that is performed
between UE 210 and wireless network 220. For example, the Extended
Service Request message, as defined in the 3GPP TS 24.301 standard,
may additionally include an "EPS Bearer Barring Status Bitmap"
field, which may include a bit corresponding to all EPS bearers
associated with wireless network 220 and/or all the activated EPS
bearers. Each bit may indicate whether the corresponding EPS bearer
is barred or allowed.
[0095] Alternatively or additionally, instead of transmitting a
separate message to convey the information indicating which bearers
are allowed or barred, the information can be communicated to UE
210 as part of the initial configuration of an EPS bearer. For
example, the Activate Default EPS Bearer Context Accept message
and/or the Activate Dedicated EPS Bearer Context Request message,
as defined in the 3GPP TS 24.301 standard, may include an "EPS
Bearer Barring Status" field, which may be assigned a value, such
as a Boolean value, indicating whether the particular EPS bearer is
a bearer that is to be allowed or barred. Thus, in this
implementation, the initial configuration of the EPS bearer may
include an indication of whether the EPS bearer should be barred
during a network congestion state. The indication of whether to bar
or not bar a particular EPS bearer may be stored by UE 210 as part
of the UE context data, such as via a "Barring Status" field added
to the UE context data or to Quality of Service (QoS) information
associated with the UE context data. For example, the UE context
data may include a "Barring Status" field that is used to indicate
the barring status of the EPS bearer when the network indicates
that there is congestion.
[0096] The initial configuration of an EPS bearer may be made in
response to execution of an application by UE 210. The received
information indicating whether the corresponding bearer is allowed
or barred may be used by UE 210 when the application is next
executed to determine whether to initiate a communication session
for the application.
[0097] Examples of "EPS Bearer Barring Status" fields, as
potentially implemented in Activate Default EPS Bearer Context
Accept message and Activate Dedicated EPS Bearer Context Request
messages, are illustrated in Tables XX and XXI. In these tables,
the "EPS Bearer Barring Status" field may identify if the EPS
bearer should be barred during a congestion condition. The field
may be a one bit Boolean value.
TABLE-US-00020 TABLE XX Activate Default EPS Bearer Context Accept
message, 3GPP TS 24.301 Information IEI Element Type/Reference
Presence Format Length Protocol Protocol M V 1/2 discriminator
discriminator 9.2 EPS bearer EPS bearer M V 1/2 identity identity
9.3.2 Procedure Procedure M V 1 transaction transaction identity
identity 9.4 Activate default Message type M V 1 EPS bearer 9.8
context accept message identity 27 Protocol Protocol O TLV 3-253
configuration configuration options options 9.9.4.11 YY EPS Bearer
EPS Bearer O TV 1 Barring Status Barring Status 9.9.4.X
TABLE-US-00021 TABLE XXI Activate Default EPS Bearer Context
Request message, 3GPP TS 24.301 Information IEI Element
Type/Reference Presence Format Length Protocol Protocol M V 1/2
discriminator discriminator 9.2 EPS bearer EPS bearer M V 1/2
identity identity 9.3.2 Procedure Procedure M V 1 transaction
transaction identity identity 9.4 Activate Message type M V 1
dedicated EPS 9.8 bearer context request message identity Linked
EPS Linked EPS M V 1/2 bearer identity bearer identity 9.9.4.6
Spare half octet Spare half octet M V 1/2 9.9.2.9 EPS QoS EPS
quality of M LV 2-14 service 9.9.4.3 TFT Traffic flow M LV 2-256
template 9.9.4.16 5D Transaction Transaction O TLV 3-4 identifier
identifier 9.9.4.17 30 Negotiated QoS Quality of O TLV 14-22
service 9.9.4.12 32 Negotiated LLC LLC service O TV 2 SAPI access
point identifier 9.9.4.7 8- Radio priority Radio priority O TV 1
9.9.4.13 34 Packet flow Packet flow O TLV 3 Identifier Identifier
9.9.4.8 27 Protocol Protocol O TLV 3-253 configuration
configuration options options 9.9.4.11 YY EPS Bearer EPS Bearer O
TV 1 Barring Status Barring Status 9.9.4.X
[0098] Examples of UE context data, being used to store a barring
status of an EPS bearer, is indicated in Tables XXII and XXIII.
TABLE-US-00022 TABLE XXII UE Context, 3GPP TS 23.401 Field
Description IMSI IMSI (International Mobile Subscriber Identity) is
the subscribers permanent identity. EMM State Mobility management
state EMM-REGISTERED, EMM-DEREGISTERED. GUTI Globally Unique
Temporary Identity. ME Identity Mobile Equipment Identity - (e.g.
IMEI/IMEISV) Software Version Number. Tracking Area List Current
Tracking area list. last visited TAI A TAI which is contained in
the TA list the UE registered to the network and which identifies
the tracking area last visited by the UE. Selected NAS Algorithm
Selected NAS security algorithm. Selected AS Algorithm Selected AS
security algorithms. eKSI Key Set Identifier for the main key
K.sub.ASME. Also indicates whether the UE is using security keys
derived from UTRAN or E-UTRAN security association K.sub.ASME Main
key for E-UTRAN key hierarchy based on CK, IK and Serving network
identity. NAS Keys and COUNT K.sub.NASint, K.sub.NASenc, and NAS
COUNT parameter. Temporary Identity used in Next update (TIN) This
parameter is used internally by the UE to memorise which temporary
ID it has to indicate in the Attach Request and RAU/TAU Request as
specified in clause 4.3.5.6. UE Specific DRX Parameters Preferred
E-UTRAN DRX cycle length Allowed CSG list The Allowed CSG list,
which is under both user and operator control, indicates the list
of CSG IDs and the associated PLMN where the UE is a member.
Operator CSG list The Operator CSG list, which is under exclusive
Operator control, indicates the list of CSG IDs and the associated
PLMN where the UE is a member. For each active PDN connection: APN
in Use The APN currently used. This APN shall be composed of the
APN Network Identifier and the default APN Operator Identifier, as
specified in TS 23.003 [9], clause 9.1.2. APN-AMBR The maximum
aggregated uplink and downlink MBR to be shared across all Non-GBR
bearers, which are established for this APN. Assigned PDN Type The
PDN Type assigned by the network (IPv4, IPv6, or IPv4v6). IP
Address(es) IPv4 address and/or IPv6 prefix Default Bearer
Identifies the default bearer within the PDN connection by its EPS
Bearer Id. The default bearer is the one which is established first
within the PDN connection. For each EPS Bearer within the PDN
connection EPS Bearer ID An EPS bearer identity uniquely identifies
an EPS bearer for one UE accessing via E-UTRAN. TI Transaction
Identifier EPS bearer QoS GBR and MBR for GBR bearer. TFT Traffic
Flow Template. Barring Status This parameter is used to indicate
the barring status of the EPS bearer when the network indicates
that there is a congestion.
As another option this information could be part of the EPS bearer
QoS, and be saved in the QoS information at the UE context.
TABLE-US-00023 TABLE XXII UE Context, 3GPP TS 23.401 Field
Description IMSI IMSI (International Mobile Subscriber Identity) is
the subscribers permanent identity. EMM State Mobility management
state EMM-REGISTERED, EMM-DEREGISTERED. GUTI Globally Unique
Temporary Identity. ME Identity Mobile Equipment Identity - (e.g.
IMEI/IMEISV) Software Version Number. Tracking Area List Current
Tracking area list. last visited TAI A TAI which is contained in
the TA list the UE registered to the network and which identifies
the tracking area last visited by the UE. Selected NAS Algorithm
Selected NAS security algorithm. Selected AS Algorithm Selected AS
security algorithms. eKSI Key Set Identifier for the main key
K.sub.ASME. Also indicates whether the UE is using security keys
derived from UTRAN or E-UTRAN security association K.sub.ASME Main
key for E-UTRAN key hierarchy based on CK, IK and Serving network
identity. NAS Keys and COUNT K.sub.NASint, K.sub.NASenc, and NAS
COUNT parameter. Temporary Identity used in Next update (TIN) This
parameter is used internally by the UE to memorise which temporary
ID it has to indicate in the Attach Request and RAU/TAU Request as
specified in clause 4.3.5.6. UE Specific DRX Parameters Preferred
E-UTRAN DRX cycle length Allowed CSG list The Allowed CSG list,
which is under both user and operator control, indicates the list
of CSG IDs and the associated PLMN where the UE is a member.
Operator CSG list The Operator CSG list, which is under exclusive
Operator control, indicates the list of CSG IDs and the associated
PLMN where the UE is a member. For each active PDN connection: APN
in Use The APN currently used. This APN shall be composed of the
APN Network Identifier and the default APN Operator Identifier, as
specified in TS 23.003 [9], clause 9.1.2. APN-AMBR The maximum
aggregated uplink and downlink MBR to be shared across all Non-GBR
bearers, which are established for this APN. Assigned PDN Type The
PDN Type assigned by the network (IPv4, IPv6, or IPv4v6). IP
Address(es) IPv4 address and/or IPv6 prefix Default Bearer
Identifies the default bearer within the PDN connection by its EPS
Bearer Id. The default bearer is the one which is established first
within the PDN connection. For each EPS Bearer within the PDN
connection EPS Bearer ID An EPS bearer identity uniquely identifies
an EPS bearer for one UE accessing via E-UTRAN. TI Transaction
Identifier EPS bearer QoS GBR and MBR for GBR bearer and Barring
Status. TFT Traffic Flow Template.
[0099] The information may also be saved in an EPS quality of
service information element. An example EPS quality of service
information element is given below in table XXIII bold text
indicates text that may be added to the 3GPP TS 24.301
standard.
TABLE-US-00024 TABLE XXIII EPS Quality of Service Information
Element, 3GPP TS 23.401 EPS quality of service IEI octet 1 Length
of EPS quality of service contents octet 2 QCI octet 3 Maximum bit
rate for uplink octet 4 Maximum bit rate for downlink octet 5
Guaranteed bit rate for uplink octet 6 Guaranteed bit rate for
downlink octet 7 Maximum bit rate for uplink (extended) octet 8
Maximum bit rate for downlink (extended) octet 9 Guaranteed bit
rate for uplink (extended) octet 10 Guaranteed bit rate for
downlink (extended) octet 11 Maximum bit rate for uplink
(extended-2) octet 12 Maximum bit rate for downlink (extended-2)
octet 13 Guaranteed bit rate for uplink (extended-2) octet 14
Guaranteed bit rate for downlink (extended-2) octet 15 Barring
Status octet 16
[0100] Process 1100 may further include receiving an indication of
whether EPS bearer barring is active (block 1130). For example, EPS
bearer barring may be made active, on a per-cell basis, based on a
congestion level associated with a radio interface of a cell
associated with eNodeB 232. Wireless network 220 may, for example,
broadcast an indication of congestion (i.e., broadcast the
indication that EPS bearer barring is active) as part of a System
Information Block Type 2 message, as defined in the technical
specification 3GPP TS 36.331. For example, a "Congestion
Indication" field, having a Boolean value, may be added to this
message.
[0101] Alternatively, the EPS bearer barring status may be assigned
as one of a number of priority levels. In this implementation, the
information indicating which bearers are allowed or barred may
instead associate an EPS bearer to a priority level. A network
priority value may act as a threshold to determine whether to allow
or bar the EPS bearer. For instance, when the network EPS bearer
barring status is equal to or greater than the priority level
assigned to a particular EPS bearer, the particular EPS bearer may
be allowed, otherwise the EPS bearer may be barred. As an example
of different EPS bearers being assigned different priority levels,
assume the EPS bearers having the IDs of 5, 6, 7, and 8, are
respectively associated with the priority levels (PL) of PL0, PL3,
PL1, and PL0, respectively. In this example, when the network
congestion level is PL2, the EPS bearers having IDs of 5, 7, and 8
may be allowed and the EPS bearer having the ID 6 may be
barred.
[0102] Alternatively, the EPS bearer barring status may be provided
as an enumeration of congestion levels. In this implementation, the
information indicating which bearers are allowed or barred may
instead associate an EPS bearer to one or more congestion levels.
The network may transmit an indication of the allowed congestion
values. EPS bearers that are associated with the current network
congestion level may be allowed, while other EPS bearers may be
barred.
[0103] In some implementations, the status relating to whether EPS
bearer barring is active, instead of being received as a Boolean
value indicating whether EPS bearer barring is active or not
active, may be received as another value, such as a probability of
performing EPS bearer barring or a time period over which EPS
bearer barring is to be active. With respect to receiving the
barring status as a probability, UE 210 may generate a random
number and compare the random number to the received probability
value to indicate whether EPS bearer barring is to be active for
the specific UE. Once the EPS Bearer is configured for that
application and a barring status is allocated, the UE may save that
information. In the future, when the UE is trying to establish a
connection for that same application, the UE may retrieve the saved
barring status of the EPS bearer that was used to carry that
application. Thus, this saved information may provide to the UE the
barring status of the application itself. Priority may thus be
given to certain applications by barring the access of other
applications. This barring functionality may apply to registered
UEs that are trying to initiate access to establish a connection
for a given application; this could happen for registered UEs in
both idle mode or connected mode. This barring can also be a
trigger for UEs that already have an application connection
established, to force the UE to drop the connection and close the
application. The techniques discussed here can apply to both cases,
depending on operator preference.
[0104] Process 1100 may further include barring requests, by
applications to the network, when the EPS bearer associated with an
application that initiated the request is barred and when EPS
barring is active (block 1140). Thus, when a data request, by an
application, is initiated at the UE when EPS bearer barring is
active, process 1100 may include barring the request when the EPS
bearer associated with the application is barred. As previously
mentioned, whether the EPS bearer associated with an application is
to be barred when EPS barring is active (e.g., due to congestion)
may have previously received, by UE 210, from wireless network 220,
either based on a message previously received from wireless network
220 or based on information obtained during a previous
configuration of the EPS bearer.
[0105] Tables XXIII and XXIV illustrate one example implementation
of a technique to indicate congestion (e.g., to indicate whether
EPS barring is active) using a System Information Block Type 2
message. Table XXIV includes field descriptions for the fields in
Table XXIII. In Table III, bold text indicates text that may be
added to the 3GPP TS 36.331 standard.
TABLE-US-00025 TABLE XXIII SystemInformationBlockType2 information
element, 3GPP TS 36.331 -- ASN1START SystemInformationBlockType2
::= SEQUENCE { ac-BarringInfo SEQUENCE { ac-BarringForEmergency
BOOLEAN, ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL, --
Need OP ac-BarringForMO-Data AC-BarringConfig OPTIONAL -- Need OP }
OPTIONAL, -- Need OP radioResourceConfigCommon
RadioResourceConfigCommonSIB, ue-TimersAndConstants
UE-TimersAndConstants, freqInfo SEQUENCE { ul-CarrierFreq
ARFCN-ValueEUTRA OPTIONAL, -- Need OP ul-Bandwidth ENUMERATED {n6,
n15, n25, n50, n75, n100} OPTIONAL, -- Need OP
additionalSpectrumEmission AdditionalSpectrumEmission },
mbsfn-SubframeConfigList MBSFN-SubframeConfigList OPTIONAL, -- Need
OR timeAlignmentTimerCommon TimeAlignmentTimer, ...,
lateNonCriticalExtension OCTET STRING (CONTAINING
SystemInformationBlockType2-v8h0- IEs) OPTIONAL, -- Need OP [[
ssac-BarringForMMTEL-Voice-r9 AC-BarringConfig OPTIONAL, -- Need OP
ssac-BarringForMMTEL-Video-r9 AC-BarringConfig OPTIONAL -- Need OP
]], [[ ac-BarringForCSFB-r10 AC-BarringConfig OPTIONAL -- Need OP
]] } SystemInformationBlockType2-v8h0-IEs ::= SEQUENCE {
multiBandInfoList SEQUENCE (SIZE (1..maxMultiBands)) OF
AdditionalSpectrumEmission OPTIONAL, -- Need OR
nonCriticalExtension SystemInformationBlockType2-v9e0-IEs OPTIONAL
-- Need OP } SystemInformationBlockType2-v13xx-IEs ::= SEQUENCE {
CongestionIndication BOOLEAN OPTIONAL, -- Need OP
nonCriticalExtension SEQUENCE { } OPTIONAL -- Need OP }
SystemInformationBlockType2-v9e0-IEs ::= SEQUENCE {
ul-CarrierFreq-v9e0 ARFCN-ValueEUTRA-v9e0 OPTIONAL, -- Cond ul-
FreqMax nonCriticalExtension SystemInformationBlockType2-v13xx-IEs
OPTIONAL -- Need OP } AC-BarringConfig ::= SEQUENCE {
ac-BarringFactor ENUMERATED { p00, p05, p10, p15, p20, p25, p30,
p40, p50, p60, p70, p75, p80, p85, p90, p95}, ac-BarringTime
ENUMERATED {s4, s8, s16, s32, s64, s128, s256, s512},
ac-BarringForSpecialAC BIT STRING (SIZE(5)) }
MBSFN-SubframeConfigList ::= SEQUENCE (SIZE
(1..maxMBSFN-Allocations)) OF MBSFN- SubframeConfig --ASN1STOP
TABLE-US-00026 TABLE XXIV SystemInformationBlockType2 Field
Descriptions ac-BarringFactor If the random number drawn by the UE
is lower than this value, access is allowed. Otherwise the access
is barred. The values are interpreted in the range [0, 1): p00 = 0,
p05 = 0.05, p10 = 0.10, . . . , p95 = 0.95. Values other than p00
can only be set if all bits of the corresponding
ac-BarringForSpecialAC are set to 0. ac-BarringForCSFB Access class
barring for mobile originating CS fallback. ac-BarringForEmergency
Access class barring for AC 10. ac-BarringForMO-Data Access class
barring for mobile originating calls. ac-BarringForMO-Signalling
Access class barring for mobile originating signalling.
ac-BarringForSpecialAC Access class barring for AC 11-15. The
first/leftmost bit is for AC 11, the second bit is for AC 12, and
so on. ac-BarringTime Mean access barring time value in seconds.
additionalSpectrumEmission The UE requirements related to IE
AdditionalSpectrumEmission are defined in TS 36.101 [42, table
6.2.4.1]. mbsfn-SubframeConfigList Defines the subframes that are
reserved for MBSFN in downlink. multiBandInfoList A list of
additionalSpectrumEmission i.e. one for each additional frequency
band included in multiBandInfoList in SystemInformationBlockType1,
listed in the same order. ssac-BarringForMMTEL-Video Service
specific access class barring for MMTEL video originating calls.
ssac-BarringForMMTEL-Voice Service specific access class barring
for MMTEL voice originating calls. ul-Bandwidth Parameter:
transmission bandwidth configuration, N.sub.RB, in uplink, see TS
36.101 [42, table 5.6-1]. Value n6 corresponds to 6 resource
blocks, n15 to 15 resource blocks and so on. If for FDD this
parameter is absent, the uplink bandwidth is equal to the downlink
bandwidth. For TDD this parameter is absent and it is equal to the
downlink bandwidth. ul-CarrierFreq For FDD: If absent, the
(default) value determined from the default TX-RX frequency
separation defined in TS 36.101 [42, table 5.7.3-1] applies. For
TDD: This parameter is absent and it is equal to the downlink
frequency. CongestionIndication This parameter is set to 1 when
there is network congestion that the network wants the UE to bar
specific applications barred to specific EPS bearers as indicated
in the BarringStatus IE.
[0106] In some implementations, during extended service request and
tracking area update procedures, UE 210 and the network can
synchronize the barring status of activated EPS bearers by adding
an information element similar to the EPS bearer context status.
Examples of an implementation of synchronization messages,
implemented as an Extended Service Request Message, Tracking Area
Update Request Message, or Tracking Area Update Accept Message, in
the 3GPP TS 24.301 standard, are illustrated below in Tables XXV,
XXVI, and XXVII, respectively. In these tables, bold text indicates
text that may be added to the 3GPP TS 24.301 standard.
TABLE-US-00027 TABLE XXV Extended Service Request Message, 3GPP TS
23.401 Information IEI Element Type/Reference Presence Format
Length Protocol Protocol M V 1/2 discriminator discriminator 9.2
Security header Security header M V 1/2 type type 9.3.1 Extended
Message type M V 1 service request 9.8 message identity Service
type Service type M V 1/2 9.9.3.27 NAS key set NAS key set M V 1/2
identifier identifier 9.9.3.21 M-TMSI Mobile identity M LV 6
9.9.2.3 B- CSFB response CSFB response C TV 1 9.9.3.5 57 EPS bearer
EPS bearer O TLV 4 context status context status 9.9.2.1 D- Device
Device O TV 1 properties properties 9.9.2.0A YZ EPS bearer EPS
bearer O TLV 4 barring status barring status bitmap bitmap
9.9.2.X
TABLE-US-00028 TABLE XXVI Tracking Area Update Request Message,
3GPP TS 23.401 Information IEI Element Type/Reference Presence
Format Length Protocol Protocol M V 1/2 discriminator discriminator
9.2 Security header Security header M V 1/2 type type 9.3.1
Tracking area Message type M V 1 update request 9.8 message
identity EPS update type EPS update type M V 1/2 9.9.3.14 NAS key
set NAS key set M V 1/2 identifier identifier 9.9.3.21 Old GUTI EPS
mobile M LV 12 identity 9.9.3.12 B- Non-current NAS key set O TV 1
native NAS key identifier set identifier 9.9.3.21 8- GPRS ciphering
Ciphering key O TV 1 key sequence sequence number number 9.9.3.4a
19 Old P-TMSI P-TMSI O TV 4 signature signature 9.9.3.26 50
Additional EPS mobile O TLV 13 GUTI identity 9.9.3.12 55
Nonce.sub.UE Nonce O TV 5 9.9.3.25 58 UE network UE network O TLV
4-15 capability capability 9.9.3.34 52 Last visited Tracking area O
TV 6 registered TAI identity 9.9.3.32 5C DRX parameter DRX
parameter O TV 3 9.9.3.8 A- UE radio UE radio O TV 1 capability
capability information information update needed update needed
9.9.3.35 57 EPS bearer EPS bearer O TLV 4 context status context
status 9.9.2.1 31 MS network MS network O TLV 4-10 capability
capability 9.9.3.20 13 Old location Location area O TV 6 area
identification identification 9.9.2.2 9- TMSI status TMSI status O
TV 1 9.9.3.31 11 Mobile station Mobile station O TLV 5 classmark 2
classmark 2 9.9.2.4 20 Mobile station Mobile station O TLV 2-34
classmark 3 classmark 3 9.9.2.5 40 Supported Supported O TLV 5-n
Codecs Codec List 9.9.2.10 F- Additional Additional O TV 1 update
type update type 9.9.3.0B 5D Voice domain Voice domain O TLV 3
preference and preference and UE's usage UE's usage setting setting
9.9.3.44 E- Old GUTI type GUTI type O TV 1 9.9.3.45 D- Device
Device O TV 1 properties properties 9.9.2.0A C- MS network MS
network O TV 1 feature support feature support 9.9.3.20A 10 TMSI
based Network O TLV 4 NRI container resource identifier container
9.9.3.24A YZ EPS bearer EPS bearer O TLV 4 barring status barring
status bitmap bitmap 9.9.2.X
TABLE-US-00029 TABLE XXVII Tracking Area Update Accept Message,
3GPP TS 23.401 Information IEI Element Type/Reference Presence
Format Length Protocol Protocol M V 1/2 discriminator discriminator
9.2 Security header Security header M V 1/2 type type 9.3.1
Tracking area Message type M V 1 update accept 9.8 message identity
EPS update EPS update M V 1/2 result result 9.9.3.13 Spare half
octet Spare half octet M V 1/2 9.9.2.9 5A T3412 value GPRS timer O
TV 2 9.9.3.16 50 GUTI EPS mobile O TLV 13 identity 9.9.3.12 54 TAI
list Tracking area O TLV 8-98 identity list 9.9.3.33 57 EPS bearer
EPS bearer O TLV 4 context status context status 9.9.2.1 13
Location area Location area O TV 6 identification identification
9.9.2.2 23 MS identity Mobile identity O TLV 7-10 9.9.2.3 53 EMM
cause EMM cause O TV 2 9.9.3.9 17 T3402 value GPRS timer O TV 2
9.9.3.16 59 T3423 value GPRS timer O TV 2 9.9.3.16 4A Equivalent
PLMN list O TLV 5-47 PLMNs 9.9.2.8 34 Emergency Emergency O TLV
5-50 number list number list 9.9.3.37 64 EPS network EPS network O
TLV 3 feature support feature support 9.9.3.12A F- Additional
Additional O TV 1 update result update result 9.9.3.0A 5E T3412
extended GPRS timer 3 O TLV 3 value 9.9.3.16B YZ EPS bearer EPS
bearer O TLV 4 barring status barring status bitmap 9.9.2.X
[0107] In tables XXV and XXVI, the field "EPS bearer barring status
bitmap" map be used to indicate the barring status of each
activated EPS bearer when EPS bearer barring is active (e.g.,
during congestion). The EPS bearer may be identified by an EPS
bearer identity value. One example of the coding the bitmap is
illustrated in Table XXVIII. As illustrated in Table XXVIII, the
bitmap may be a four octet bitmap in which the first octet in which
the first octet includes the EPS bearer barring status bitmap IEI,
the second octet includes the length of the bitmap contents, and
bit values labeled as EBI(0) through EBI(15). EBI(x) may be encoded
as follows:
EBI(0)-EBI(4): spare bits that may be encoded as zero;
EBI(5)-EBI(15): a zero value indicates that the EPS bearer barring
status during congestion is "bearer context not barred," and a one
value indicates that the EPS bearer barring status during
congestion is "bearer context barred."
TABLE-US-00030 TABLE XXVIII EPS bearer barring status bitmap IEI
octet 1 Length of EPS bearer barring status bitmap contents octet 2
EBI(7) EBI(6) EBI(5) EBI(4) EBI(3) EBI(2) EBI(1) EBI(0) octet 3
EBI(8) EBI(9) EBI(10) EBI(11) EBI(12) EBI(13) EBI(14) EBI(15) octet
4
[0108] FIG. 12 is a diagram of example components of a device 1200.
Each of the devices illustrated in FIGS. 1A, 1B, 2, and 5-9 may
include one or more devices 1200. Device 1200 may include bus 1210,
processor 1220, memory 1230, input component 1240, output component
1250, and communication interface 1260. In another implementation,
device 1200 may include additional, fewer, different, or
differently arranged components.
[0109] Bus 1210 may include one or more communication paths that
permit communication among the components of device 1200. Processor
1220 may include processing circuitry, such as a processor,
microprocessor, or processing logic that may interpret and execute
instructions. Memory 1230 may include any type of dynamic storage
device that may store information and instructions for execution by
processor 1220, and/or any type of non-volatile storage device that
may store information for use by processor 1220.
[0110] Input component 1240 may include a mechanism that permits an
operator to input information to device 1200, such as a keyboard, a
keypad, a button, a switch, etc. Output component 1250 may include
a mechanism that outputs information to the operator, such as a
display, a speaker, one or more light emitting diodes (LEDs),
etc.
[0111] Communication interface 1260 may include any
transceiver-like mechanism that enables device 1200 to communicate
with other devices and/or systems. For example, communication
interface 1260 may include an Ethernet interface, an optical
interface, a coaxial interface, or the like. Communication
interface 1260 may include a wireless communication device, such as
an infrared (IR) receiver, a Bluetooth.RTM. radio, a WiFi radio, a
cellular radio, or the like. The wireless communication device may
be coupled to an external device, such as a remote control, a
wireless keyboard, a mobile telephone, etc. In some embodiments,
device 1200 may include more than one communication interface 1260.
For instance, device 1200 may include an optical interface and an
Ethernet interface.
[0112] Device 1200 may perform certain operations described above.
Device 1200 may perform these operations in response to processor
1220 executing software instructions stored in a computer-readable
medium, such as memory 1230. A computer-readable medium may be
defined as a non-transitory memory device. A memory device may
include space within a single physical memory device or spread
across multiple physical memory devices. The software instructions
may be read into memory 1230 from another computer-readable medium
or from another device. The software instructions stored in memory
1230 may cause processor 1220 to perform processes described
herein. Alternatively, hardwired circuitry may be used in place of
or in combination with software instructions to implement processes
described herein. Thus, implementations described herein are not
limited to any specific combination of hardware circuitry and
software.
[0113] In the preceding specification, various embodiments have
been described with reference to the accompanying drawings. It
will, however, be evident that various modifications and changes
may be made thereto, and additional embodiments may be implemented,
without departing from the broader scope of the invention as set
forth in the claims that follow. The specification and drawings are
accordingly to be regarded in an illustrative rather than
restrictive sense.
[0114] For example, while series of blocks have been described with
regard to FIGS. 4 and 11, the order of the blocks may be modified
in other implementations. Further, non-dependent blocks may be
performed in parallel.
[0115] It will be apparent that example aspects, as described
above, may be implemented in many different forms of software,
firmware, and hardware in the implementations illustrated in the
figures. The actual software code or specialized control hardware
used to implement these aspects should not be construed as
limiting. Thus, the operation and behavior of the aspects were
described without reference to the specific software code--it being
understood that software and control hardware could be designed to
implement the aspects based on the description herein.
[0116] Further, certain portions of the invention may be
implemented as "logic" that performs one or more functions. This
logic may include hardware, such as an ASIC or a FPGA, or a
combination of hardware and software.
[0117] Even though particular combinations of features are recited
in the claims and/or disclosed in the specification, these
combinations are not intended to limit the invention. In fact, many
of these features may be combined in ways not specifically recited
in the claims and/or disclosed in the specification.
[0118] No element, act, or instruction used in the present
application should be construed as critical or essential unless
explicitly described as such. An instance of the use of the term
"and," as used herein, does not necessarily preclude the
interpretation that the phrase "and/or" was intended in that
instance. Similarly, an instance of the use of the term "or," as
used herein, does not necessarily preclude the interpretation that
the phrase "and/or" was intended in that instance. Also, as used
herein, the article "a" is intended to include one or more items,
and may be used interchangeably with the phrase "one or more."
Where only one item is intended, the terms "one," "single," "only,"
or similar language is used. Further, the phrase "based on" is
intended to mean "based, at least in part, on" unless explicitly
stated otherwise.
* * * * *